Correct option is A
Correct answer:(a) pH below 5.5
Tooth decay begins when the pH level in the mouth drops below a certain threshold, which leads to the demineralization of tooth enamel.
Explanation:
- pH below 5.5: This is the correct answer. Tooth enamel starts to dissolve and decay when the pH of the mouth falls below5.5. At this pH, the acids in the mouth begin to erode the enamel, leading to cavities.
- pH 6: At pH 6, the enamel is still safe, as the pH is slightly acidic but not low enough to cause decay. Decay typically does not begin at this pH level.
- pH 7: A pH of 7 is neutral (neither acidic nor alkaline). At this pH, the mouth is in a balanced state, and tooth decay does not occur.: A pH above 7 is alkaline, which is generally not harmful to tooth enamel. In fact, an alkaline environment can help neutralize acids in the mouth, potentially reducing the risk of tooth decay.
Conclusion:
Tooth decay starts when the pH in the mouth dropsbelow 5.5, making A) pH below 5.5the correct answer.
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