A wedge-shaped defect is a defect in the hard tissue of the tooth on the labial and buccal surfaces of the tooth (near the gum), and is so named because it is often wedge-shaped. Now we know what is meant by a wedge-shaped defect is a defect that occurs in the hard tissue of the tooth at the cervical part of the lip and buccal surface of the tooth (near the gum), and it is named because this defect is often wedge-shaped. When a wedge-shaped defect is done, then one may ask: What causes a wedge-shaped defect to occur? Let’s learn more about the causes of wedge-shaped defect. 1, brushing, is caused by the various causes of wedge-shaped defect among an important aspect that can not be ignored, therefore, some people will be wedge-shaped defect called brushing wear. ① people who do not brush their teeth rarely have typical wedge-shaped defects, while people who brush their teeth, especially those who brush with force across the teeth, often have typical and severe wedge-shaped defects; ② wedge-shaped defects generally do not occur on the lingual side of the teeth; ③ wedge-shaped defects of teeth with labial misalignment are often more severe; ④ teeth with wedge-shaped defects are often accompanied by gingival recession. 2, the characteristics of the tissue structure of the cervical part of the tooth: the structure of the cervical part of the tooth at the boundary of the glazed tooth bone is relatively weak, easy to be worn, conducive to the occurrence of defects. 3, the role of acid: the acidic exudate in the gingival sulcus is related to the occurrence of wedge-shaped defects. Clinical sometimes see the defect of the hard tissue under the gingival margin, and the defect of the lingual side, is a hint of this relationship. 4, fatigue of dental materials: recent studies have shown that the cervical part of the buccal side of the tooth is the area of occlusal force stress concentration, long-term chewing pressure will cause stress fatigue of dental tissue, and damage will occur in the stress concentration area. What are the usual symptoms of a tooth with a wedge-shaped defect? Depending on the degree of defect, wedge-shaped defects can be divided into three types: superficial, deep and pulp-penetrating. Superficial and deep defects can usually be asymptomatic, or symptoms of dentin hypersensitivity can occur. Depth and symptoms are not necessarily proportional to each other, and the key is individual differences. Pulp-piercing defects are often accompanied by symptoms of pulp disease, periapical disease, and in severe cases, even lateral fracture of the tooth. When a wedge-shaped defect in a tooth is detected, treatment should be sought promptly from the doctor. The treatment of wedge-shaped defect can be talked about from the following aspects: 1. Those with less tissue loss and no dentin hypersensitivity do not need special treatment. 2.For those who have dentin allergy, desensitization therapy is available for treatment. 3, the tissue defect is larger, available filling method treatment. Fill with glass ionomer or composite resin; if the cavity is deep or has sensitive symptoms, it should be bedded before filling. 4.When accompanied by pulpitis or periapical inflammation, root canal treatment can be used. 5.If the defect has led to the transverse fracture of the tooth and the formation of the residual root, then according to the condition and conditions, root canal treatment can be performed after the overdenture repair, or the residual root can be extracted.