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Fluoride in drinking water does not negatively affect cognitive ability — and may actually provide benefit, study finds

A national study of nearly 27,000 teens found no cognitive harm from fluoride at recommended levels; over 62% of Americans receive fluoridated water, researchers said.

  • The new study found robust evidence that young people exposed to recommended levels of fluoride in drinking water performed better on cognitive tests than their peers without fluoride exposure, as noted by Dr. Rob Warren.
  • Utah and Florida have banned the practice of adding fluoride to municipal drinking water, following claims by Secretary Robert F. Kennedy Jr. regarding IQ loss due to fluoride.
  • The study followed nearly 27,000 individuals and showed that consistent exposure to fluoride correlated with higher high school test scores and did not contribute to cognitive decline as they aged.
  • The American Dental Association supports community water fluoridation, considering 0.7 milligrams of fluoride per liter as optimal, while the US Centers for Disease Control and Prevention has not changed its recommendations.
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ABC Australia broke the news in Australia on Wednesday, November 19, 2025.
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