The results of a new federal analysis were drawn from studies conducted in other countries, where drinking water contains more fluoride than in the United States.

A rigorous nine-year research review looking at the relationship between fluoride and intelligence in children concludes that as fluoride levels rise, IQ drops.

A review of 74 medical studies links higher fluoride exposure to lower IQ in kids — but mostly draws on research that took place outside of the U.S. and had a high risk of biased results. Why it matters: The federally funded analysis could further stoke the debate over adding fluoride to drinking water as Robert F.

A new report linking fluoridated drinking water to lower IQ scores in children is sure to ratchet up the debate over a practice that's considered one of the greatest public health achievements of the 20th century.

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.

Being exposed to high levels of fluoride could impact intelligence. According to a new government survey, fluoride levels in children’s urine were measured. They reported a drop in IQ scores as fluoride levels rose.