Many patients come to the clinic and say, “Recently, my teeth have been sore and achy from eating cold and hot, and when I look in the mirror, I see a small prong in my neck.” These small ridges are wedge-shaped defects. Wedge-shaped defect is a defect caused by the slow depletion of hard tissues on the cervical side of the tooth’s lip and cheek, and it is named because it is often wedge-shaped. The etiology of wedge-shaped defect: 1, brushing This is the main reason for the occurrence of wedge-shaped defect, wedge-shaped defect is also known as brushing wear. The reasons for this are: (1) people who brush hard across the teeth often have a typical and severe wedge-shaped defect. (ii) It does not occur on the lingual side of the tooth. ③The wedge defect is often more severe in teeth with labial misalignment. ④The teeth with wedge-shaped defects are often accompanied by gingival recession. 2, the structure of the cervical part of the tooth The structure of the cervical part of the tooth at the boundary of the enamel and bone is weak and easy to be worn away, which is conducive to the occurrence of defects. 3, the role of acid The acidic exudate in the gingival sulcus is related to the defect. Clinically, sometimes see the defect of the hard tissue under the gingival margin. 4, the tooth lip and buccal side of the neck is the occlusal force stress concentration area. Long-term chewing force fatigues the tooth tissue and damage occurs in the stress concentration area. Don’t look at the wedge-shaped defect is a small groove, not early to see but a lot of problems.