The US Public Health Service recommends a fluoride concentration that is half the amount considered safe by the WHO. Several international epidemiological studies conducted in Canada, China, India, Iran, Pakistan, and Mexico on pregnant women, infants, and children exposed to fluoride levels over 1.5 mg per liter of drinking water revealed lower IQs. The authors propose additional research to better understand the potential risks linked to low levels of fluoride exposure, but some caution and concern are warranted which can help set the stage for better regulation.
The US has accumulated 50 years of data demonstrating the positive effects of fluoride. Often, the issue with these foreign research papers is that they exhibit significant bias. The sample sizes are yet another concern. The locations are different, as the foreign studies can't relate to the American circumstancescontext. TooThere much chlorine can represent a real problem, and it has in some cases. Nevertheless, there are numerous safeguards in the water systems to prevent excessive quantities of fluoride.
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