Levels of fluoride higher than in drinking water may be linked to lower IQs

Fluoride exposure appears to slightly decrease IQ scores in children, a new federal meta-analysis has concluded -- but not at the low levels recommended for U.S. drinking water.

Fluoride in drinking water was associated with reduced IQ scores at levels of less than 4 milligrams per liter, but not at less than 1.5 mg/L, according to the analysis by researchers at the National Institute of Environmental Health Sciences.

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