What Causes the Critical PH to Be Reached During Formation

What causes the critical pH to be reached during formation of dental caries?

A) The saliva stagnates and putrefies, producing a large amount of acid.
B) The bacteria in saliva cause an immune response to occur, lowering the pH in the mouth.
C) Lysozyme in saliva lyses bacteria, causing the release of internal chemicals from the dead bacterial cells, which lower the pH in the mouth.
D) Plaque bacteria convert dietary sugar into acids.

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