Most of fluorine (F) in the body contain bones and teeth. Fluoride, the fluorine ion is widely distributed in nature. Fluoridated drinking water is the main source of fluoride. Fluoro lack fluoride deficiency can potentially lead to tooth decay and osteoporosis. Fluorinated water containing less than the ideal amount of 1 ppm, reduces the incidence of caries. Is the drinking water not fluorinated in the residential area of ??a child, oral fluoride supplements may be prescribed. Fluorintoxikation fluorine in excess accumulates in bones and teeth, fluorosis occurs. Fluorinated drinking water that has been enriched with above 10 ppm, is a frequent cause of this is. Permanent teeth, which develop at high fluorine feed, have most likely to a fluorosis. Thus fluorosis occurs even when the milk teeth that fluoride exposure has to be much more intense. The first signs of Fluorintoxikation are chalk-white, irregularly distributed spots on the tooth enamel surface. These spots turn yellow-brown, so that the teeth get a characteristic mottled surface. A severe intoxication weakens the enamel, on its surface to form dimples. Bone changes as osteosclerosis, exostosis of the spinal cord and genu valgum occur in adults who have high fluoride intake over a longer period. Tests for the diagnosis of toxicity do not exist. The treatment of Fluorintoxikation comprises reducing the fluoride uptake; so patients should drink in areas with highly fluoridated water, no water and perform no fluoride supplements. Children should be encouraged not to swallow fluoride toothpaste.