Fluoride-IQ Study Fuels Debate Over U.S. Water Fluoridation

A new meta-analysis links high fluoride exposure to lower IQ in children, but experts question its methodology and relevance to U.S. water standards.

The study, published in JAMA Pediatrics, found a statistically significant link between high fluoride exposure and reduced IQ in children, based on a review of 74 international studies.
Critics highlight methodological flaws, including potential bias in study selection and unreliable measures of long-term fluoride exposure, such as urinary fluoride levels.
The analysis found no evidence linking fluoride levels typical in U.S. public water systems (0.7 mg/L) to IQ reductions, with effects observed only at higher concentrations above 1.5 mg/L.
Public health experts remain divided, with some calling for reassessment of fluoride's risks during early brain development, while others maintain its safety and benefits for dental health at current levels.
The findings have reignited discussions on local water fluoridation policies, as some communities in the U.S. have already opted to cease the practice.