Amount of mutans streptococci

If oral infection by mutans streptococci is not sufficient, dental caries is not induced in the experimental animal despite feeding with a caries-inducing diet. The amount of mutans streptococci adhered on teeth also influences the development of caries. Accordingly, the amount of mutans streptococci in the oral cavity should be measured periodically until the end of the experimental schedule. According to several studies, dental caries is definitely induced if the amount of mutans streptococci is >105 colony-forming units (CFU)/mL (Ooshima et al, 1993; Tsunehiro et al, 1997).

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