The causes of severe tooth wear include the following: 1. If a missing tooth is not repaired in time, the habit of chewing on one side can be formed, and the biting burden of one side of the tooth is greater, and the tooth surface will soon undergo heavy wear and lose its anatomical form. 2. If you have tetracycline teeth, enamel hypoplasia or poor mineralization, the structure of the tooth tissue is looser, and the tooth will undergo severe wear under repeated chewing and friction. 3. When teeth grinding, clenching, etc., teeth keep close contact without rest, which can produce excessive wear. 4, choose to apply a hard toothbrush and long-term horizontal horizontal brushing, can make the tooth neck of the bone and dentin heavy wear, forming a wedge-shaped defect. 5, like to eat hard food will cause serious wear of teeth, resulting in dentin allergy.