How do low levels of fluoride act to prevent dental caries primarily by topical mechanisms after tooth eruption has occurred?

Question

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The Answer is Low levels of fluoride act to prevent dental caries primarily by topical mechanisms after tooth eruption has occurred:
-By enhancing the remineralization of teeth
-By inhibiting the demineralization of teeth
-By inhibiting specific bacterial enzymes

How Do Low Levels of Fluoride Act to Prevent Dental