in these 3 communities caries prevalence fell to the lowest level reached , so far , by means preventive measures in bettlach ( canton of solothurn , toothbrushing with fluoride solutions 6 times per year combined with information , fluoride tablets on every school day , and in addition consumption of table salt fluoridated at a suboptimal level of 90 ppm ) .
C0011334
caries
C0016327
fluoride