Fluoride concentration in dental plaque of naval recruits with and without caries

Plaque samples were evaluated for fluoride concentration, the degree of the fluoride binding and uptake of fluoride from 1 and 225 parts/10(6) F solutions. The plaque of the caries-free individuals contained significantly higher fluoride concentrations, but no difference was found in binding strength between the caries-free and caries-active groups. Uptake of fluoride from a 1 part/10(6) solution was slightly less for plaque of caries-free recruits, but there was no difference between the groups in uptake from the more concentrated solution.