the incidence of caries in terms of the so-called dfs ( = decayed filled surfaces ) index was ascertained for test persons aged from 6 to 15 years , in a community with a drinking water supply having a naturally increased fluoride content ( falkenberg/oberpfalz , 1.8 ppm f ' ) in comparison with test persons from a neighbouring community with a drinking water supply having a low-fluoride content ( fuchsmuhl/oberpfalz , 0.05 ppm f ' ) .
C0011334
caries
C0016327
fluoride