Abstract
In a study of caries in school-children in high and low fluoride areas, the amount of fluoride in samples of clinically normal surface enamel on the labial face of the upper permanent lateral incisors in vivo was found to be positively related not only to the fluoride content of the domestic water supply but also to the volume of plaque on the tooth surface and the increase of hydrogen ion activity in the plaque during fermentation of sucrose. These observations suggest that plaque may serve as a means of introducing additional fluoride into enamel after tooth eruption.
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