Abstract
Base line data of mottling in 15 yr old children was gathered. The survey was performed in low fluoride Barnsley area ppm (F = 0.1 ppm) in Dec., 1976. In a random convenience sample, 270 children were examined. The mouth prevalence of mottling was 36.3% and the tooth prevalence was 8.8%. There was no sex difference in the prevalence of mottling. Over 83% of mottling was white (types A and B). Mottling occurred most frequently in the maxillary incisors and was most common in the incisal 3rd of all incisors examined. The results are compared with data from 6 other studies where the same classification of mottling was used.

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