Colonization of a new smooth surface of a tooth will occur by S. mutans when its level in the oral cavity reaches:
Correct Answer: 4.5 x 104/ml
Description: Levels of S.mutans greater than 105 are indicative of an acceptable cariogenic challenge because colonization does not occur until the level of S. mutans reaches 4.5×104/ml for smooth surface and 103/ml of occlusal fissures.
Several clinical studies have corroborated the finding that the percentage of S.mutans in saliva increases significantly as a function of the DMFS score.
There is thus substantial evidence for associating high S.mutans counts with caries activity.
Shafers textbook of Oral Pathology – page 468
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Dental
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