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The consistency of colonization of tooth surfaces byStreptococcus mutans was studied by sampling four approximal molar surfaces of 9- to 13-year-old children at weekly intervals. It was found that surfaces which harbored detectable levels of the organism tended to be consistently positive, whereas surfaces which were free of detectable levels of the organism also tended to remain that way. Of the total surfaces studied, 81.7% were either consistently positive or consistently negative throughout five consecutive weekly samplings. These data indicate thatS. mutans does not uniformly colonize the surfaces of teeth. The consistent localized patterns of colonization observed suggest thatS. mutans is not readily transmitted from one tooth surface to another within the mouth. Scanning electron microscope observations revealed thatS. mutans colonized the teeth of monoinfected gnotobiotic rats as discrete localized colonies, whereas strains ofActinomyces naeslundii colonized in a more generalized manner. Efforts to sterilize tooth surfaces by application of iodine solution indicated that the populations ofS. mutans on some surfaces could be affected for at least 11 to 13 weeks after treatment. The number of tooth surfaces colonized by detectable proportions ofS. mutans was found to be far lower in a group of 18 children from Charlotte, N.C., with a low past caries experience than in 20 children from Danvers, Mass., with a high caries experience. The number of tooth surfaces infected withS. mutans therefore strongly paralleled the caries experience of these populations.

Interdental Localization of Streptococcus mutans as Related to Dental Caries Experience