So what really causes cavities in the first place? In a word, plaque. Plaque is continually deposited on the teeth and contains bacteria that feeds on ingested carbohydrates and sugars left behind on the surface of your teeth. The bacteria produce a by-product, acid, that is deposited on the surface of the teeth. This acid then penetrates the enamel of the tooth. As the cavity progresses past the enamel, it invades the underlying layer of the tooth, the dentin, and may reach the nerve of the tooth which causes toothache. Your dentist can detect cavities through x-rays or oral exams.
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