A U.S. government report concludes that fluoride in drinking water at twice the recommended limit is linked with lower IQ in children. The report, based on an analysis of previously published research, marks the first time a federal agency has concluded that there is a link between higher levels of fluoride exposure and lower IQ in kids. Fluoride strengthens teeth and reduces cavities by replacing minerals lost during normal wear and tear. The addition of low levels of fluoride to drinking water has long been considered one of the greatest public health achievements of the last century.
