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 new report that analyzes research on fluoride and IQ scores finds that the more fluoride a child is exposed to, the lower he or she tends to score on intelligence tests. The findings' relevance to the U.

A new government study reviewing past research on the safety of fluoride for children found a slight decrease in IQ scores overall as levels of fluoride exposure increase. But the authors acknowledged that many of the papers included in the new analysis had a “high risk of bias,

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.

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.

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.

An analysis of more than 70 studies on fluoride and IQ levels concluded there was a relationship between higher levels of the common water additive and lower IQ levels in children, though a large percentage of the studies were noted as having a “high risk of bias.