A cavity is a hole in a tooth caused by a buildup of bacteria called plaque. Teeth are normally protected by a layer of enamel, the hardest substance in the human body. But the bacteria in plaque consume leftover sugar from the food we eat. They produce acid as a byproduct. This acid slowly dissolves the enamel. Eventually the enamel is completely worn away and a cavity forms. Then, it is time for a visit to the dentist to get a filling.

Question

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Cavities are formed by the _________ of enamel.

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A flexibility
B inclusion
C production
D erosion

Answer 1

D erosion