Dental wedge-shaped defects are defects caused by slow depletion of hard tissues in the labial and buccal cervical regions of the teeth, which are often wedge-shaped, hence the name. It may be related to the wrong brushing method, the structure of the cervical region of the teeth, and the fatigue of the dental tissues. 1. Wrong brushing method: This is the main cause of wedge-shaped defects, especially some people like to brush horizontally, which is easy to wear down the teeth, resulting in wedge-shaped defects. 2. Structure of the neck of the tooth: the structure at the border of enamel and bone in the neck of the tooth is weak and easy to be worn down. And when the acid acts on the teeth, it causes easy to cause defects. 3. Tooth tissue fatigue: buccal neck is the occlusal stress concentration area, long-term application is easy to fatigue the neck tissue to form internal damage, the formation of wedge-shaped defects. Dental wedge-shaped defects can also be seen in other causes, it is recommended to consult a doctor in a timely manner, follow the doctor’s instructions for relevant examinations, with the help of the doctor to clarify the cause, and targeted treatment or treatment.