A comprehensive analysis of dozens of studies has strengthened the link between fluoride exposure and lower IQ, raising questions about public water fluoridation policies.
Douglas Main reports for The New Lede.
In short:
- The study, published in JAMA Pediatrics, reviewed 74 studies and found fluoride exposure correlated with lower IQ in 64 cases, with high-exposure groups averaging a 7-point IQ deficit.
- The findings indicate that even low levels of fluoride in urine, common in fluoridated communities, show a negative association with IQ.
- The analysis follows a 2024 court ruling requiring the EPA to address fluoride's "unreasonable risk" and coincides with rising public opposition to water fluoridation.
- Researchers remain divided on removing fluoride from water systems, with some citing the role of fluoride in preventing cavities and related health problems.
Key quote:
“We can no longer afford to sweep this under the carpet.”
— Bruce Lanphear, health sciences professor, Simon Fraser University
Why this matters:
Lower IQ in children can affect educational and economic outcomes, with even small average declines having widespread societal impacts. The debate raises concerns about how best to balance cavity prevention and associated health risks with potential neurodevelopmental risks.
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