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What is the main cause of tooth decay?

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Production of excess acid by the bacteria

Production of excess base by the bacteria

Bacteria directly destroy the tooth enamel

Eating more junk food

answer is A.

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Detailed Solution

Tooth enamel is the hardest substance in the body. When the food or carbohydrates remaining in the mouth are degraded by the bacteria of the mouth, acids are produced. When the pH of the mouth drops below 5.5, the tooth enamel starts decaying.

Hence, the main cause of tooth decay is the production of excess acid by bacteria.

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