Tag Archives: SciBlogs

It’s time we did something about sugar

sugar-caries

I saw this image in the paper:

Sheiham, A., & James, W. P. T. (2014). A reappraisal of the quantitative relationship between sugar intake and dental caries: the need for new criteria for developing goals for sugar intake. BMC Public Health, 14(1), 863.

It’s a very graphic illustration of the central role played by dietary sugar in tooth decay. Certianly makes one think about how to drastically reduce our dietary sugar intake.

There are a couple of “take home messages” in the paper:

“Sugar is the primary cause of dental caries”

Ths seems to have been debated in the past but is now widely accepted. Because acid attack arising from sugar metabolism is the only mechanism for inducing caries:

“the only confounding factors i.e. tooth brushing and the use of fluoride in drinking water or toothpaste serve to reduce the magnitude of the simple relationship between sugar intake changes and caries incidence.”

However fluoride is not a “silver bullet:”

“although fluoride reduces caries, unacceptably high levels of caries in adults persist in all countries, even in those with widespread water fluoridation and the use of fluoridated toothpastes [21].”

We shouldn’t neglect adult tooth decay

Perhaps we have been underestimating the problem because the apparent improvement in oral health comes from considering data for children:

“The sugar-caries relationship in adults has been largely ignored: all the conclusions on safe levels of sugar and the relationship between sugar and caries are based on children’s data. With fluoride and greater dental care caries has declined in children so some dental authorities have concluded that sugars are not a major determinant of caries provided fluoride toothpaste is use diligently with or without water fluoridation. However, it is now evident that the majority of caries occurs in adults, not in children, because the disease is cumulative and the rates of caries in individuals tracks from early childhood to adolescence and then into adulthood [21,26]. So the conclusion that sugar is not the major determinant of caries, is simply wrong.”

The impact of fluoride

Anti-fluoride propagandists are already quoting this research – using the central role of sugar to imply this proves fluoride is ineffective. But the authors say:

“Fluoride is associated with about 25% lower caries experience when sugar intakes are constant between 10-15%E [10-15% of energy itnake from sugar]  in 12 year-old children [20]. The widescale use of fluoride toothpaste is a reasonable explanation for the decline in children’s caries in many countries since the 1970s, yet what then becomes relatively evident is that caries becomes more prominent in adolescents and adults [4,21].

Ireland has had a mandatory national water fluoridation policy since 1964 but some areas have not implemented the fluoridation policy thereby allowing a comparison within a country where fluoride toothpaste is in widespread use but drinking water fluoride varies. Additional benefits accrued from having fluoride in water as well as toothpastes but 7.3% of even the youngest adults aged 16-24 years with lifelong fluoride exposure still had dental caries experience in 4.6 teeth as did 53% of the 35-44-year-olds assessed 35 years after the beginning of water fluoridation: the mean DMFT was 13.3 and 16.0 in those living in non-fluoridated areas [15]. Australia has water fluoridation in a number of cities, but despite fluoride use from both toothpastes and drinking water the mean DMFT and DF Surfaces for all adults increased; adults aged 65 years and older had ten times higher levels of caries than 15–24-year-olds [16]. Thus although fluoride reduces caries, unacceptably high levels of caries in adults persist in all countries, even in those with widespread water fluoridation and the use of fluoridated toothpastes [21].”

So research is showing a strong need to cut dietary sugar intake by both children and adults.  The authors say “for multiple reasons, including obesity and diabetes prevention, we need to adopt a new and radical policy of progressive sugar reduction.” They conclude:

“that public health goals need to set sugar intakes ideally <3%E with <5%E as a pragmatic goal, even when fluoride is widely used. Adult as well as children’s caries burdens should define the new criteria for developing goals for sugar intake.”

Obviously community water fluoridation (CWF) remains an important issue in New Zealand because political activists still work hard to remove it, or prevent it when health authorities attempt its introduction. It seems to me, though, that CWF, once achieved, plays its important role without having to continually educate and encourage the population to change their dietary habits. The battle over sugar will be so much harder because it will involve social pressure to change personal habits, as well as countering all the anti-science and freedom of choice arguments.

At least local body councils, and immature local body politics, will not play a key role.

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Crude dredging of the scientific literature

I am always amazed at how some people will crudely misrepresent the scientific literature in their efforts to pretend their particular political agenda is scientifically valid. The way they will dredge the scientific literature searching for studies they can quote and misrepresent seems an extreme form of cherry picking and confirmation bias. Surely those indulging in such crude literature dredging are fully aware of what they are doing.

Here is an example of literature dredging I picked up recently. The offender is Michael Connett, Special Projects Director for Paul Connett’s Fluoride Action network (yes – a bit of nepotism there. Son Michael and Wife Ellen are on the payroll). Michael has a legal qualification, but no scientific qualification. Nevertheless, one of his special projects is a litrerature database anti-fluoride activists can use in their propaganda.

Any and every scientific publication that can be quoted, misquoted or misrepresented in arguments against fluoridation.

Here are a couple of slides from Michael’s talk at recent anti-fluoride get-together organised by the Connetts. It’s about “Fluoride and  IQ Studies” and the section was meant to show that recent research confirms community water fluoridation is bad for our brain. So he found 4 studies from on rats from 2014.

I have extracted from each cited paper details from the conclusions and the fluoride concentrations of the drinking water given to the rats.

Keep in mind that in New Zealand the recommended optimum concentration for community fluoridated water is 0.7 – 1.0 mg/L.


1-connett-m.fan-conference

“We found that NaF treatment-impaired learning and memory in these rats.” The NaF treatments were 25, 50 and 100 mg/L!


4-connett-m.fan-conference

“these results indicated that long-term fluoride administration can enhance the excitement of male mice, impair recognition memory, . . ” The NaF treatments were 25, 50 and 100 mg/L!


3-connett-m.fan-conference

“exploration preference in the novel object recognition test was significantly altered in mice treated with 5 and 10 mg/L NaF compared with the water-treated control animals.”


2-connett-m.fan-conference

“These data indicate that fluoride and arsenic, either alone or combined, can decrease learning and memory ability in rats.” “The rats in the F, As, and F+As groups had access to drinking water with a 120 mg/L NaF solution, 70 mg/L NaAsO2 solution, and combined 120 mg/ L NaF and 70 mg/L NaAsO2 solution for 3 months, respectively.


It’s the old story. Find evidence for adverse effects at concentration much higher the optimum and pretend the results apply to the optimum.

Beware of political activists who claim their agenda has scientific support. There is a good chance they are manipulating the science.

Update

Surpise, suprise. FAN has used young Michael’s talk at their get-together to launch a press release - Fluoride’s Brain Damage Studies Mounting. This will be sent through their usual social media merry-go-round in the hope that the MSM picks it up somehwere.

Just what one expects from a political activist organisation.

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Anti-fluoride activists define kangaroo court as “independent”

A kangaroo court is a mock or illegal court that is set up in violation of established legal procedure

The international anti-fluoride movement seems somewhat pre-occupied with thew situation in New Zealand.  In the last few months they have unleashed their “big guns” to attack two publications from local scientific researchers.  First was their attempt to discredit the paper Broadbent, J. M., Thomson, W. M., Ramrakha, S., Moffitt, T. E., Zeng, J., Foster Page, L. A., & Poulton, R. (2014). Community Water Fluoridation and Intelligence: Prospective Study in New Zealand. American Journal of Public Health. Now they have produced an International Peer Review of the  review Health Effects of Water Fluoridation: a Review of the Scientific Evidence. This was commissioned by Sir Peter Gluckman, the New Zealand Prime Minister’s Chief Science Advisor and Sir David Skegg, President of the Royal Society of New Zealand at the request of Auckland City on behalf of several local Councils.

Fluoride Free NZ pretends that the Royal Society Review “was sent out for review by five independent international experts” and a press release from their astroturf organisation the NZ Fluoridation Information Service repeats the independent claim (see NZ fluoridation report trashed by international reviewers).

Well let’s have a look. How independent are the authors of the critique?

An “independent” peer review?

I don’t think so. Here are the authors – chosen by the anti-fluoride movement, of course – together with affiliations and a little history


Kathleen Theissen, Environmental Risk Scientists. I don’t know what the affiliation “environment Risk Scientists,” is. Perhaps a consultancy. However, she is still listed as an affiliate on the Oak Ridge Center for Risk Analysis web site. Theissen was one of the minority* anti-fluoride members on the National Research Council Committee on Fluoride in Drinking Water which produced the NRC reviewFluoride in Drinking Water: A Scientific Review of EPA’s Standards.” She frequently writes articles and submissions opposing community water fluoridation

Chris Neurath, Research Director, American Environmental Health Studies Project. Neurath is also the “Research Director,” of Paul Connett’s Fluoride Action Network (FAN). The American Environmental Health Studies Project is really just the Fluoride Action Network in drag with a couple of other similar organisations tied in.

Hardy Limeback, Head of Preventive Dentistry, University of Toronto. Limeback was also an anti-fluoride minority member of the  National Research Council Committee on Fluoride in Drinking Water which produced the NRC review Fluoride in Drinking Water: A Scientific Review of EPA’s Standards.” He is also an anti-fluoride activist who writes often on the issue and a member of the Advisory Board of Paul Connett’s Fluoride Alert Network.

 

James Beck, a co-author together with Paul Connett of the anti-fluoridation book The Case against Fluoride.

Spedding Micklem, also a co-author together with Paul Connett of the anti-fluoridation book The Case against Fluoride.


So, definitely not independent

This is a serious distortion of the truth by Fluoride Free NZ because they have continual described the authors of the Royal Society Review as not independent. They wrote, for example (see Fluoridation review ‘Dirty Science’ – Fluoride Free NZ):

“The NZ “expert panel” included only people who were already known to be ardently in favour of fluoridation and not one single person who is known to be opposed, or even someone neutral. It was therefore already a foregone conclusion.”

So, I can only conclude that these people define “independent” to mean that they agree with them – they have an anti-fluoride political stance. And they define anyone whose scientific work produces an objectively determine conclusion favourable to the consensus understanding of the effectiveness and safety of community water fluoridation as not independent!

I can only repeat, how do these hypocritical people sleep straight in their bed’s at night.

How valid are their criticisms

OK, so these people are not independent – but how valid are there criticisms. That is another issue. I am preparing a detailed analysis of the claims made in this critique and will post it in the next few days. So, watch this space.


*Three of the 12 members of the committee expressed disagreement with some fo the committee’s conclusions.

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Do you prefer dental fluorosis or tooth decay?

Anti-fluoride propagandists often use the incidence of dental fluorosis as an argument against community water fluoridation. However, they exaggerate the problem by misrepresenting the issue in two ways:

1: They present the issue as if the figures for the incidence of dental fluorosis relate to the severe forms when they don’t. Most cases of dental fluorosis in areas using CWF are classified as questionable or mild. Yet the anti-fluoride people will present images of severe dental fluorosis which is never caused by CWF (see ). Severe forms are caused by excessive toothpaste consumption, high natural fluoride levels or industrial contamination. Never by CWF.

The figure below shows the incidence of the different dental fluorosis categories in New Zealand (data taken from 2009 New Zealand Oral health Survey – see Our Oral Health).

And here are some accurate images of dental fluorosis provided by the Centers for Disease Control and Prevention (CDC).

Accurate-Photos-of-Fluorosi

 (Double click to enlarge)

2: They will then go on to claim that dental fluorosis is disfiguring and destroys the quality of life of the afflicted. Of course this may be true in countries where severe dental fluorosis occurs,* but not in countries like New Zealand where CWF is used.

A recently published study objectively determined the effect of dental fluorosis and dental decay on 5,474 North Carolina schoolchildren and their families – Effects of Enamel Fluorosis and Dental Caries on Quality of Life. It found no statistically significant association between dental fluorosis and oral-health related quality of life scores. Probably what one would expect because the incidence of dental fluorosis was about 28% and most of this was questionable or very mild.

But what about the effect of tooth decay on quality of life? In this case the results were statistically insignificant showing that dental caries does decrease the quality of life.

Their overall conclusions – a child’s caries experience negatively affects oral health-related quality of life, while fluorosis has little impact.

I think many of us can relate to this from our own childhood experience.


*The mainly poor quality IQ studies anti-fluoridation activists like Paul Connett love to quote were made in areas of high natural fluoride where dental and skeletal fluorosis is endemic. Such studies are not relevant to the issue of CWF, but they do raise in my mind the effect of severe dental fluorosis on quality of life, learning problems and hence possibly IQ measurements (see my article Confirmation blindness on the fluoride-IQ issue). Personally I think any disfiguring oral defect like bad tooth decay or severe dental fluorosis would effect a child’s quality of life and potentially cause learning defects and so drop in IQ.

In countries like NZ such effects on quality of life and learning are much more likely to result from bad dental decay than severe dental fluorosis. If anything, perhaps CWF actually reduces learning problems and potentially prevents decreases in IQ.

Update:

Another study invesdtigatign the influence of tooth decay and dental fluorsis on quality of life is described in the paper by Do, L. G., & Spencer, A. (2007). Oral Health-Related Quality of Life of Children by Dental Caries and Fluorosis Experience. Journal of Public Health Dentistry, 67(3), 132–139.

This also concluded that caries and less acceptable appearance showed a negative impact, while mild fluorosis had a positive impact on child and parental perception of oral health-related quality of life.

See also:

New report from the National Fluoridation Information Service – Dental fluorosis – is it more than an aesthetic concern? Its key findings are:

“Evidence does not indicate there are any health risks associated with CWF at the levels of 0.7 to 1.0 mg/L in New Zealand, and no severe dental fluorosis, or skeletal fluorosis, has been found. While fluoride is incorporated into teeth and bones, there is no robust evidence of toxic accumulation of fluoride in other tissues in the body. CWF in New Zealand has been found to not lead to anything more than very mild or mild dental fluorosis for a small “

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Emotion Drives Decision

emotion

Image Credit: Gaping Void

So true.

 

Ingested fluoride, dental health and old age

dentistWhen we who are chronologically challenged get together we often discuss health – and sometimes compare notes.  But, strangely, I have never heard people discuss their dental health. Don’t know why, but I started to wonder if I was the only one with my particular problem.

These days I seem to visit my dentist quite often – but current tooth decay is never the problem. Its more likely to be tooth fracture – bits of teeth breaking away or chipping off. So I asked a couple of dentists if I was unusual – or is tooth fracture just another problem of old age.

Turns out I am quite normal, at least in this respect. Dentists do find tooth fracture is more common than tooth decay at my age.* To me this underlines an important fact – what happens in our youth can affect us for the rest of our life, and particularly in our old age.

This goes for our teeth, as well as our brain. Our teeth form and develop in our early years. So the damage we do during their development comes back to bite us, as it were, 60 or more years later. Just as child abuse or neglect can have psychological effects in old age, it can also have dental effects.

Nutritional deficiencies during these early years can increase risk of developmental defects of the teeth and dental caries throughout the rest of our lives. Because teeth development is completed by age 8 we are stuck with these defects for the rest of our lives.

Fluoride and teeth development

Fluoride deficiency can be a factor in tooth development defects. This is because it is a normal and natural part of the tooth mineral, the tooth apatite. Fluoride lowers the solubility of apatites and makes them stronger and harder. Consequently, fluoride deficiency in childhood weakens tooth enamel and can  produce a susceptibility to tooth fracture later in life.

I think it is important to realise this. Recently I heard someone claim that ingested fluoride only has an effect on developing teeth in children so was of no benefit to adults.  A very short-sighted understanding –  children turn into adults.

Another reason I think it is important to understand the importance of ingested fluoride to our teeth throughout our life is the propaganda from anti-fluoride activists claiming that ingested fluoride does not influence out teeth. They have taken on the scientific understanding of the reaction of fluoride at the tooth surface which inhibits demineralisation to argue that ingesting fluoride is like drinking sun tan lotion because the effect is, they claim, purely topical.

That is a misrepresentation – and one that causes  confusion when anti-fluoride campaigners make these claims in their submission to councils. (The Hamilton City Council even advanced this misunderstanding as accepted knowledge – see When politicians and bureaucrats decide the science).

A more balanced understanding of the science shows the beneficial effects of fluoride intake is both systemic (via ingested fluoride) and topical (via the surface reaction at the tooth surface). Incorporation of fluoride into the bioapatites forming our teeth and bones strengthens and hardens them. This occurs during tooth development. Because the tooth material is stronger and harder it is less likely to suffer from fractures, scratching and similar damage.

On the other hand, fluoride intake helps protect existing teeth from decay because of the surface reaction inhibiting demineralisation of the teeth. Just from a chemical perspective the presence of calcium, phosphate and fluoride in saliva and tooth biofilms helps prevent tooth decay resulting from acid attack and demineralisation. But from a mechanical perspective if our teeth are harder and stronger there will also be fewer physical defects providing sites for the chemical acid attack.

Fluoride benefits from ingestion and surface effects

Anti-fluoride propagandists have worked hard to deny any benefits of fluoride on dental health. Often they fall back on the argument that any benefits arise only form a “topical” effect. They usually interpret this to mean tooth brushing or dental topical applications.

However, consumption of fluoridated water and food enables transfer of fluoride to saliva and biofilms on the teeth. This fluoride, together with calcium and phosphate on the saliva, reduces acid attack on the teeth and so helps prevent tooth decay. Because fluoride concentrations in saliva decrease within an hour or so after brushing, fluoridated water complements use of  fluoridated toothpaste. We are in more regular contact with food and water than we are with toothpaste

But ingestion of fluoride in food and drink during tooth development in children also helps harden and strengthen tooth enamel. This benefits a person’s teeth throughout their life by helping prevent  and tooth fracture and physical defects. Harder tooth enamel will reduce tooth decay by preventing physical formation of sites for it to take hold, even though the acid attack is itself a chemical, surface effect.

So, even the chronologically challenged benefit from community water fluoridation. And you young ones – remember one day you are going to be old and your quality of life may well depend on the community water fluoridation you had access to as a child.


*Apparently tooth decay can still return as a major problem in old age because the withdrawal of gums from the tooth roots open new sites for decay. This is known as root caries.

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August ’14 – NZ blogs sitemeter ranking

 
Hager
Bloggers in the thick of election campaign? Image Credit: Against the Current


PLEASE NOTE: Sitemeter is playing up again making it impossible to automatically get the stats using the normal process. I have done a manual work around but it was still impossible to get the stats for a number of blogs that I list below. Maybe more bloggers will shift to StatCounter or other counter.

No stats could be found for these blogs:

Blog
Works in progress
Weakly Whirled News
Two Minutes Sport
Wysiwygpurple’s Blog
Stats Chat
Social Media and the 2014 General Election
Love your work
Today is my birthday
This Mum Rocks
Sportsfreak
Infectious thoughts
Science Behind the Curtain
Grumpollie
Louis’ Outlook
West City Darts
Woodleigh Nursery
Kyle MacDonald
A conservative perspective
Save our schools NZ

There are now over 300 blogs on the list, although I am weeding out those which are no longer active or have removed public access to sitemeters. (Let me know if I weed out yours by mistake, or get your stats wrong).

Every month I get queries from people wanting their own blog included. I encourage and am happy to respond to queries but have prepared a list of frequently asked questions (FAQs) people can check out. Have a look at NZ Blog Rankings FAQ. This is particularly helpful to those wondering how to set up sitemeters.

Please note, the system is automatic and relies on blogs having sitemeters which allow public access to the stats.

Here are the rankings of New Zealand blogs with publicly available statistics for August 2014. Ranking is by visit numbers. I have listed the blogs in the table below, together with monthly visits and page view numbers.

Meanwhile I am still keen to hear of any other blogs with publicly available sitemeter or visitor stats that I have missed. Contact me if you know of any or wish help adding publicly available stats to your bog.

You can see data for previous months at Blog Ranks

Subscribe to NZ Blog Rankings

Subscribe to NZ blog rankings by Email

Find out how to get Subscription & email updates

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Sad news – Victor Stenger has died

Stenger

I was sad to read that Victor Stenger died during the week at the age of 79.

Victor was a prolific author, writing on science, religion and philosophy. He often dealt with difficult issues coming out of the religion-science debates and was always able to explain complex subjects very effectively for the layperson.

In his retirement, after a career in particle physics research, Stenger took to writing popular books in science, religion and philosophy and participating in the public discussion and debate of these issues. Although not as prominent as the people usually called the “New Atheists” he was one of that group. In fact he wrote a book  titled The New Atheism: Taking a Stand for Science and Reason. (See my review of this book at Defending science and reason).

Victor was also well-known for public debates with religious apologists like William Lane Craig and Hugh Ross. I believe his role in these were important because of his ability to explain particle and cosmological physics and thereby show how these apologists had been distorting the science. Readers interested in watching some of these debates will be able to find them on YouTube.

I suppose it is fitting that Victor Stenger was writing till the end. He died with one book waiting to be published – God and the Multiverse: Humanity’s Expanding View of the Cosmos.

Victor will be missed not only by his family and people who knew him, but also by many readers.

I urge interested readers to read one or more of his popular science book. Wikipedia lists the following –  all published by Prometheus Books:

See also:
Victor Stenger, Physicist and Prolific Atheist Author, is Dead at 79
Victor Stenger has died.

The links below are to my own reviews of a few of Victor Stenger’s books:

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Making money out of fanatics

bad science

Click on image to enlarge

This looks like a Xcd cartoon. I picked it up from a new Facebook page The Girl Against Fluoride Lies. Good to see more and more Facebook pages like this.

Speaking of fluoride – the cartoon sort of reminds me of Paul Connett’s book – The case against fluoride?

 

Dirty politics on the Royal Society fluoride review

Anti-intellectualism has been a constant thread winding its way through our political and cultural life nurtured by the false notion that democracy means that my ignorance is just as good as your knowledge

In Anti-fluoride activists unhappy about scientific research I related how local anti-fluoride propagandists were busy rubbishing the Royal Society of NZ  fluoride review – even before it was released. Now that it is released (see Health Effects of Water Fluoridation: a Review of the Scientific Evidence) they have gone into a manic mode – launching press releases and facebook attacks. Given that some of these were launched within hours of the report’s release these propagandists hadn’t bother actually reading the report itself.

These attacks are typical of anti-science people when confronted with scientific information undermining their strong beleifs. As we say in New Zealand, these critics “play the man rather than the ball.” But first, let’s deal with  the single criticism of the scientific content of the report – the question of the mechanisms of the beneficial roles of fluoride for teeth.

The old “topical” argument

The anti-fluoride brigade has a thing about this – claiming that the mode of action of fluoride is by topical contact with the teeth – and then usually they try to claim only high concentrations, as in toothpaste, are effective topically. Anything to rule our a role for fluroidated drinking water.

The Royal Society report discusses various studies, saying they:

“suggest that the predominant effect of fluoride is mainly local (interfering with the caries process) rather than systemic (pre-eruptively changing enamel structure), though the latter effect should not be dismissed.”

It then discusses the evidence for a systemic role in the section Contribution of pre-eruptive fluoride exposure to preventive effects.

“Despite a substantial body of evidence suggesting that the predominant effect of fluoride in mitigating the caries process occurs post-eruptively and topically, some recent studies provide additional evidence of a systemic effect of fluoride on pre-erupted teeth. Singh et al.[79] found that fluoride is acquired in enamel during crown completion in the first permanent molars, during the time that the matrix is formed and calcified in the first 26-27 months of life. The same group had previously evaluated the pre- and posteruptive effects of fluoride exposure at the individual level, controlling for multiple fluoride sources and potential confounders, and showed a significant effect of pre-eruptive fluoride exposure on caries in permanent teeth.[80] However, they determined that maximum benefit was gained by having both pre- and post-eruptive fluoride exposure. Other groups have also found that a higher percentage of total lifetime exposure to fluoride was associated with lower caries burden,[81-83] indicating that fluoride is effective throughout the lifespan, including pre-eruptively.”

Being a scientific review, let’s list the citations used in the section quoted. Interested readers can check them out:

79: Singh, K.A., A.J. Spencer, and D.S. Brennan, Effects of water fluoride exposure at crown completion and maturation on caries of permanent first molars. Caries Res, 2007. 41(1): p. 34-42.
80: Singh, K.A., A.J. Spencer, and J.M. Armfield, Relative effects of pre- and posteruption water fluoride on caries experience of permanent first molars. J Public Health Dent, 2003. 63(1): p. 11-9.
81: Slade, G.D., et al., Associations between exposure to fluoridated drinking water and dental caries experience among children in two Australian states. J Public Health Dent, 1995. 55(4): p. 218-228.
82: Slade, G.D., et al., Caries experience among children in fluoridated Townsville and unfluoridated Brisbane. Aust N Z J Public Health, 1996. 20(6): p. 623-9.
83: Spencer, A.J., J.M. Armfield, and G.D. Slade, Exposure to water fluoridation and caries increment. Community Dent Health, 2008. 25(1): p. 12-22.

Hardly suprising to anyone recognising that reality is rarely as simple as they might desire. The benefits of fluoride are confered both by a systemic effect on pre-erupted teeth and by a topical or surface effects on existing teeth.

Yet Fluoride Free NZ claims (see Fluoridation review ‘Dirty Science’)

“One surprise is that the review has gone so far as to claim that fluoridation works systemically (i.e. by swallowing) before teeth erupt.

This belief was not only scientifically discredited 15 years ago by the US Public Health Service’s Centers for Disease Control, but has also been acknowledged as wrong in court in sworn affidavits by Health Ministry representatives and is contrary to what the top consultant to the MoH’s National fluoridation Information Service told the Hamilton City Council last year”

No real citations there to list – just the “authority” of ignorance. The idea that, as Isaac Asimov said, “democracy means that my ignorance is just as good as your knowledge.”

I discussed this attempt by Fluoride Free NZ to distort the evidence and literature in my articles Fluoridation – topical confusion and Topical confusion persists. It seems that Fluoride Free NZ would have been happier if the authors of this review had actually ignored the scientific literature on the topic.

Media Manipulation

I will leave aside for now the emotive language and personal attacks used by the anti-fluoride propagandists in their attacks on this review. Also, I will ignore their laughable suggestions for the “experts’ they would have liked to see on the review panel and their demand that such review should actually be a public discussion (yet they refuse to allow any open discussion on their own facebook pages!).

Let’s just consider why these people take the effort to submit press statements that few credible news sources would bother picking up. I discussed this in Anti-fluoridationist astro-turfing and media manipulation where I illustrated how planted press releases were picked up by tame “natural” health websites, Paul Connett’s Fluoride Alert website and their own Facebook and twitter social media. this self-promotion get’s requoted by anti-fluoride propagandists around the world – and sometime even makes its way into mainstream media.

Wellington Anti-fluoride dentist, Stan Litras, planted just such a press release. He provided a misleading headline Review ‘confirms fluoridation must end’ which was picked up and circulated by Connett’s Fluoride Alert. It has also been heavily circulated on Twitter and anti-fluoride Facebook pages.

I guess there are now a host of anti-fluoride activists around the world who actually believe the Fluoride Review produced by the Royal Society of New Zealand recommended the end of fluoridation!

Yet, in fact, the review concluded:

“Councils with established CWF [community water fluoridation] schemes in New Zealand can be confident that their continuation does not pose risks to public health, and promotes improved oral health in their communities, reducing health inequalities and saving on lifetime dental care costs for their citizens. Councils where CWF is not currently undertaken can confidently consider this as an appropriate public health measure, particularly those where the prevalence and severity of dental caries is high.”

How do these guys sleep straight in their bed at night?

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