A. In the range 5.5-6.5
B. In the range of 8-9
C. Less than 5.5
D. Is in the range of 6.5-7.5
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A. In the range 5.5-6.5
B. In the range of 8-9
C. Less than 5.5
D. Is in the range of 6.5-7.5
Answer: C. Less than 5.5 Tooth decay starts when the pH of the mouth is less than 5.5 .
Answer: C. Less than 5.5
Tooth decay starts when the pH of the mouth is less than 5.5 .
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