Comparison of caries prevalence 7 years after discontinuation of school-based fluoride rinsing or toothbrushing in Norway

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Abstract
Caries prevalence was compared in 2 groups of 21-yr-olds 6-7 yr after discontinuation of school-based preventive programs consisting respectively of fortnightly rinsing or brushing 3-5 times per yr with NaF solutions. Stratified random samples of 125 persons were drawn from appropriate population registers. Nonresponse was 30%. Blind clinical and radiographic examinations were carried out and the subjects were interviewed concerning their dental health related behavior. Results revealed significantly lower mean DMFS [decayed-missing-filled surfaces] score in the rinsing than in the brushing group (P < 0.001). Persistence of benefits of school-based preventive programs after discontinuation is suggested.