Fluoride is added to drinking water to prevent dental caries. In practice fluoride concentrations exceed recommended levels and may cause harm to teeth and bones.
Evidence from:
Committee on Fluoride in Drinking Water, National Research Council ISBN: 0-309-10128-X,
“Fluoride in Drinking Water: A Scientific Review of EPA’s Standards”
Safe and harmful levels are detailed in the report. An effect on children is described.
Further detail: