Abrasion is the abnormal wear of a tooth. It is usually caused by a toothpaste which is too abrasive(gritty). This combined with aggressive brushing with a hard bristled brush is the main cause. A v-shaped groove is cut in the soft dentine core of the tooth, where the root joins the crown.
Abrasion exposes the nerve endings in the dentine and the tooth becomes sensitive to hot and cold.
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