The report has reignited the debate over fluoride in drinking water, revealing that exposure levels exceeding twice the recommended limit are linked to child's low IQ score. This is the first time a federal agency has confirmed with "moderate confidence" a connection between high fluoride levels and reduced cognitive function in kids.
The report, released by the National Toxicology Program (NTP) and part of the Department of Health and Human Services (HHS), is based on a review of studies from several countries, including Canada, China, India, Iran, Pakistan and Mexico. It highlights that drinking water with fluoride concentrations above 1.5 milligrams per liter is linked to a decrease in IQ. Some studies suggest a drop of two to five IQ points in children with higher fluoride exposure. (Related: COGNITIVE RETARDNATION: Fluoride exposure during pregnancy increases risk of neurodevelopmental issues in children.)
Historically, fluoride has been praised for its role in preventing tooth decay. Since Grand Rapids, Michigan, first fluoridated its water in 1945 and federal endorsement in 1950, the practice has been seen as one of public health's greatest achievements. However, with the rise of fluoride toothpaste and increased scrutiny, health officials lowered the recommended fluoride levels in drinking water from 1.2 milligrams per liter to 0.7 milligrams in 2015 to address issues like dental fluorosis, which causes unsightly spots on teeth.
The Environmental Protection Agency (EPA) has long set a maximum fluoride limit of four milligrams per liter to prevent skeletal fluorosis, a condition that affects bone strength. However, emerging research has focused on potential neurological impacts, particularly concerning developing fetuses and young children exposed to formula mixed with fluoridated water.
In 2006, the National Research Council (NRC) flagged the potential neurological effects of high fluoride levels – prompting calls for more research. The NTP's comprehensive review, which began in 2016, aimed to provide clarity on whether stricter fluoride limits are needed. The final report has faced delays but underscores the need for continued research and policy discussions.
Millions of Americans living with excessive fluoride in water systems
As the debate continues, the new report adds urgency to the discussion about fluoride's safety and impact on public health – particularly for vulnerable populations.
University of Florida researcher Ashley Malin emphasized the importance of this report for understanding fluoride's risk. She said pregnant women should consider reducing fluoride intake, including from certain teas.
According to government report, about 0.6 percent of Americans – nearly two million – are on water systems with naturally occurring fluoride levels of 1.5 milligrams or higher.
"The findings from this report raise the questions about how these people can be protected and what makes the most sense," said Malin.
Malin noted that pregnant women living in these over-fluoridated areas need to immediately lower their fluoride intake not only from water but also from certain types of other food products like tea. Malin added that it is also necessary to have policy discussions about whether to require fluoride content labels on beverages.
Learn more about the negative effects of fluoride on the population at Fluoride.news.
Research links high levels of fluoride in drinking water to lower IQs in children. Watch this video.
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Study finds fluoride exposure before birth can affect a child’s brain development and behavior.
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