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Fluoride Can Reduce IQ in Children

August 13, 2013

A group of researchers reviewed studies from around the world in order to determine if fluoride (usually from fluoridated drinking water) may cause neurotoxicity in children. Their study went on examine the potential impact that fluoride may have on children’s IQ scores.

After careful analysis, the researchers were able to measure a significant difference between children who had been exposed to higher levels of fluoride and those who had not. They found that “children in high-fluoride areas had significantly lower IQ scores than those who lived in low-fluoride areas.”

This is obviously a major concern as much of the drinking water in the United States contains some level of fluoride. The Researchers concluded that “the results support the possibility of an adverse effect of high fluoride exposure on children’s neurodevelopment. Future research should include detailed individual-level information on prenatal exposure, neurobehavioral performance, and covariates for adjustment.”

The EPA requires fluoride levels to be no more than 4.0 mg/L or 4.0 ppm, with a recommended level of 2.0 mg/L or 2.0 ppm. IN January 2011, the U.S. Department of Health and Human Services and Environmental Protection Agency recommended that these levels be reduced to 0.7 mg/L or 0.7 ppm. Concerned parents would be wise to contact their water company and ask for a report showing the amount of fluoride in their drinking water and consider supplementing with bottled water if they believe it is too high.

Read the Abstract


3 Responses to “ Fluoride Can Reduce IQ in Children ”

  1. Bob Mason on August 17, 2013 at 9:31 pm

    Your claim that a scientific study has suggested that intentional fluoridation of drinking water is dangerous to children is unfounded. This report is about high levels of fluoridation – usually naturally occurring fluoridation – of between 2-4 mg per liter. Public health fluoridation is between .7 and 1.2 mg/L. The study you cite clearly states that it is not assessing the risks of the benefits of these lower rates, and also explicitly notes that the CDC has determined that the benefits outweigh the risks.

    Many people believe that fluoridation is bad because it is ‘not natural’. This report finds that the naturally occurring fluoridation is the genuine danger.

  2. Steven D. Slott on August 13, 2013 at 7:56 am

    Wow, could this “writer” , chiropractor, or whatever he is, have gotten his facts any more garbled?

    The “group of researchers” to which he refers is actually Choi, Grandjean, et al, of Harvard, who conducted a review of 27 Chinese studies they found in obscure Chinese scientific journals. The studies, which no one seems to be sure have even been translated into English by any objective source, did NOT address fluoridated drinking water. They were in regard to the effect of high levels of naturally occurring fluoride in the well water of various Chinese and Mongolian villages. By the admission of the lead authors of this review, the studies were missing information, had questionable methodologies, and inadequate controls for variables. These studies were so flawed as to cause the lead authors to issue this statement in September of 2012:

    “These results do not allow us to make any judgment regarding possible levels of risk at levels of exposure typical for water fluoridation in the U.S. On the other hand, neither can it be concluded that no risk is present. We therefore recommend further research to clarify what role fluoride exposure levels may play in possible adverse effects on brain development, so that future risk assessments can properly take into regard this possible hazard.”

    –Anna Choi, research scientist in the Department of Environmental Health at HSPH, lead author, and Philippe Grandjean, adjunct professor of environmental health at HSPH, senior author

    The EPA has a primary maximum contaminant level (MCL) for fluoride and a secondary MCL for fluoride in eater, of 4.0 ppm and 2.0 ppm respectively. The primary MCL is enforceable, the secondary MCL is not.

    “EPA has set an enforceable regulation for fluoride, called a maximum contaminant level (MCL), at 4.0 mg/L or 4.0 ppm. MCLs are set as close to the health goals as possible, considering cost, benefits and the ability of public water systems to detect and remove contaminants using suitable treatment technologies.”

    “The secondary standard of 2.0 mg/L is intended as a guideline for an upper bound level in areas which have high levels of naturally occurring fluoride. The level of the SMCL was set based upon a balancing of the beneficial effects of protection from tooth decay and the undesirable effects of excessive exposures leading to discoloration.”


    In 2011, the DHHS did NOT recommend that the EPA primary and secondary MCLs be reduced. In 2011, the DHHS recommended that the optimal level of fluoride in drinking water be changed from a range
    of 0.7 ppm -1.2 ppm to just 0.7 ppm. The optimal level of fluoride is that level which has been deemed to provise maximum decay prevention while causing no adverse effects. This recommendation had nothing to do with EPA MCLs., and was made in recognition of the fact that there are more sources of fluoride consumption now than when the optimal was originally set. This is exactly the responsible oversight we expect from our government agencies.

    In the entire 68 year history of water fluoridation, there have been NO proven adverse effects attributable to it, with there being countless, peer-reviewed scientific studies demonstrating its effectiveness in the prevention of dental decay.

    Steven D. Slott, DDS

  3. Water Works on August 13, 2013 at 6:29 am

    Water fluoridation in an absurd forced medication policy that should be stopped immediately.

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