The effect of an annual application of a F- -lacquer on dental caries was investigated in a 3-yr study. Two groups of children 10 and 12 yr of age at baseline were examined. At the end of the study no significant difference in DMFS could be detected between test and control group. The following factors might have affected this negative result: firstly, the use of other forms of F- supplementation, secondly, the relatively low caries experience in both groups and thirdly, the frequency and mode of application of the F- -lacquer.
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Eck et al. (1984) studied this question.
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