Abstract
Comparisons were made between the enamel F levels of (1) young children and adolescents (difference in mean age 8.6 yr) in a non-fluoridated area, and (2) 11 to 13.5-yr-old and 13.5 to 15-yr-old children (difference in mean age < yr) in six locations with different water F contents. The comparisons were made on the basis of enamel biopsies taken from corresponding sites of the labial surface of a maxillary central incisor in each subject. The results showed a consistent trend towards lower mean F concentrations in the older than in the younger group. Statistically significant differences were observed in five of the locations. It is concluded that F lost by abrasion in young individuals is not compensated for by uptake from the natural oral environment.
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