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Water Fluoridation Study Finds No Evidence of Cognitive Harm

New PNAS study using Wisconsin cohort data finds no negative association between community water fluoridation and adolescent IQ or cognitive performance across the life course.

  • By

  • Kerri Miller

  • April 23, 2026

  • 4 min

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  • 1

    A study found no negative association between community water fluoridation and adolescent IQ or cognitive functioning throughout life.

  • 2

    The research utilized data from the Wisconsin Longitudinal Study, involving a representative sample of 10,317 high school graduates.

  • 3

    Participants were classified into four fluoride exposure categories based on historical records and naturally occurring fluoride levels.

  • 4

    After adjusting for confounders, no significant associations between fluoride exposure and cognitive outcomes were observed.

  • 5

    The findings contrast with recent state-level decisions to end community water fluoridation in various U.S. locations.

Original Source(s)

Water Fluoridation Study Finds No Evidence of Cognitive Harm

  • by Kerri Miller

  • April 23, 2026

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