the.com/fluoride
The mineral bodyguard your teeth never asked for but desperately needed.
means A compound of fluorine added to water and toothpaste to harden tooth enamel and fight decay.
from From fluorine, named for the mineral fluorspar (Latin fluere, to flow) used since medieval times to make ores melt more easily in furnaces.
First cityGrand Rapids fluoridated its water in 1945.
Natural originSpotted after fluorspar-stained teeth resisted decay anyway.
Dose mattersToo much causes fluorosis, mottling the enamel white.