What are the safe levels of fluoride?
Levels below two milligrams per liter are considered safe and beneficial to teeth and bones. A secondary standard for fluoride has been set by the EPA at two milligrams per liter to protect consumers against dental fluorosis. The Environmental Protection Agency has set standards for public water supplies for fluoride at four milligrams per liter. Some individuals that consume water in excess of four milligrams per liter over many years could get bone disease, which can include pain and tenderness of the bones.
