It is one of the most active elements of the halogen group. It is never found free in nature. Traces of fluorine are present in bones, teeth, thyroid gland and skin. It protects teeth from decay. There is no evidence that it is indispensable in other tissues.
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Fluorine has been all recognised as controlling tooth decay and it is now that it is considered as an essential nutrient. Though the exact nature of its metabolic role has not been established, but there is evidence that growth and possibly reproduction in animals is retarded when the diet is deficient in fluorine.