The three factors required for the development of caries are a susceptible tooth,a diet rich in fermentable carbohydrates,and:

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The caries process requires a susceptible tooth,a diet rich in fermentable carbohydrates,and specific bacteria.The two specific groups of bacteria in the mouth that are responsible for caries are lactobacilli and mutans streptococci.
Decay is caused by acids produced by the bacteria as a byproduct of their digestion of food rather than by the acidity of the food itself.

The Three Factors Required for the Development of Caries Are