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Dr. Dean's research on the fluoride-dental caries relationship, published in 1942, included 7,000 children from 21 cities in Colorado, Illinois, Indiana, and Ohio. The study concluded that the optimal amount of fluoride which minimized the risk of severe fluorosis but had positive benefits for tooth decay was 1 mg per day, per adult.
The lethal dose for most adult humans is estimated at 5 to 10 g (which is equivalent to 32 to 64 mg elemental fluoride per kg body weight). [53] [54] [55] A case of a fatal poisoning of an adult with 4 grams of sodium fluoride is documented, [56] and a dose of 120 g sodium fluoride has been survived. [57]
Building on these findings, a 2025 JAMA systematic review and meta-analysis of 74 studies across 12 countries provided further evidence of fluoride’s neurotoxicity, showing significant dose-response associations between fluoride exposure and reduced IQ in children. Even at urinary fluoride concentrations below the WHO’s 1.5 mg/L guideline ...
"There was not enough data to determine if 0.7 mg/L of fluoride exposure in drinking water affected children’s IQs," Taylor noted. Fda Bans Red Food Dye Due To Potential Cancer Risk
After fluoride was added in many places to the U.S. water supply, tooth decay declined in both children and adults, and complete tooth loss in older adults became more rare, according to federal ...
A rigorous nine-year research review looking at the relationship between fluoride and intelligence in children concludes that as fluoride levels rise, IQ drops. Every 1 part per million increase ...
Water fluoridation is the controlled addition of fluoride to a public water supply to reduce tooth decay, and is handled differently by countries across the world. [2]Water fluoridation is considered very common in the United States, Canada, Ireland, Chile and Australia where over 50% of the population drinks fluoridated water.
In a landmark case, Fluoride Action Network and other health advocacy groups successfully argued that fluoride levels currently promoted as “optimal” by the EPA and other government agencies pose a significant threat to public health, particularly to the cognitive development of children. The United States District Court for the Northern ...