Caries prevalence among adults in communities with optimal and low water fluoride concentrations.

The aim of this study was to compare the dental health status of adults measured as caries prevalence in two socioeconomically similar communities with optimal and low water fluoride concentrations respectively. Other topical fluoride sources are also taken into consideration. The study is based on clinical and radiological examinations of 30-40-yr-old subjects who for all their lives have been drinking water with a fluoride concentration representative for the community. 260 individuals resident in the optimal fluoride area and 236 from the low fluoride are included in the study. The results show that caries prevalence was lower in the optimal fluoride area. Caries prevalence was higher in women than in men within both groups. The prevalence of primary caries was low but significantly higher in the low fluoride area, principally in the form of proximal caries. Caries prevalence was not influenced by other topical fluoride sources.