Abstract
The toxic action of ingested fluorine compounds was first observed among people living in places where the fluorine content of the water was high. The clinical picture was dominated by the easily detectable lesions in the enamel of the teeth. Later injury to domestic animals also was found. Bovines have been reported to be more sensitive than man, and they are the most susceptible among the domestic animals, the susceptibility decreasing in the order: Cattle, sheep, rabbits, swine, rats and poultry (Phillips et al. 1955).