the reduction in dental caries observed on both deciduous and permanent teeth as a result of twelve years of fluoridation of drinking water , which was started in karl-marx-stadt in 1959 , was followed , because of the necessity to temporarily discontinue the addition of fluorine salts to the drinking water , by a slight increase in caries which could be checked through refluorination .
C0016327
fluorine
C0011334
caries