Abstract
ENDEMIC fluorosis has been described in many different parts of the world. Dental fluorosis is found with waters having a fluorine content of one part per million, and in the United States considerable thought has been given to the elimination of ‘mottled enamel’ by improving water supplies1. Stiff backs and other signs of toxic fluorosis are found when the halogen exceeds three parts per million, and in North Africa, where the amount of fluorine in the soil is considerable, attention has been directed to the agricultural and veterinary, as well as to the human aspects of the problem2. Industrial fluorosis among aluminium workers who handle cryolite has been described in Denmark3. In Arizona, Smith and others1 found that fluorine plus diet deficiency was a more potent cause of mottled enamel than fluorine alone.
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