FLUORINE DEFICIENCY

condition in which an organism fails to receive an adequate supply of fluorine, a water-soluble element stored in teeth and bones which strengthens them by aiding in the retention of calcium. Massive doses of fluorine or fluoride compounds can be lethal, and fluorides are used as the toxic ingredient of many insect poisons. Scientists feel they have proved conclusively, however, that dental caries is reduced in areas where natural fluoridation of water is moderate. This mineral has been added to water supplies, although such actions have in some cases provoked controversy. Studies have determined that the enamel of sound teeth contains more fluoride than is found in the teeth of persons prone to dental caries. Excess amounts of fluorine may cause tooth mottling, which presents no problem other than appearance. Fluorine is also known to decrease the incidence of rickets in infants and children. It accentuates the effect of thyroid secretion in maintaining a normal basal metabolic rate. It has been determined that fluorides in minute amounts limit the acid production of bacteria in the mouth.