Recently many patients come to fill teeth, besides tooth decay, there is also a defect in the cervical part of the tooth (scientific name wedge-shaped defect), causes such as external stimulation (is caused by toothbrush bristles too hard, often forceful horizontal brushing teeth, over time in the cervical part of the tooth will form a small gap, sometimes cause tooth soreness); oral cavity bad environment (there is the role of acid, acidic secretions in the gingival sulcus, saliva PH value is low, acidic food, stomach disease acid reflux Exposure to acid work may decalcify and dissolve the hard tissues of teeth); low systemic immunity (dry mouth, diabetes, hypertension, heart disease, etc.), how to avoid it should also be something we need to pay attention to in the future. Wedge-shaped defect is a defect formed by the slow depletion of hard tissues in the neck of the tooth, in the shape of a “V”, the defect is smooth, hard and shiny, neatly edged, with exposed dentin, progressively stained with brown, and sensitive to chemical temperature stimulation. It is often accompanied by gingival atrophy, root exposure, and in severe cases, it can develop into pulpitis, apical inflammation, tooth loosening, tooth fracture, etc. It is common in anterior teeth, bicuspids, labial surface of molars, and is mostly found in patients above middle age. How to treat: 1. For patients with little tissue loss and no conscious symptoms of soreness, no special treatment is needed locally. 2, pay attention to the correct method of brushing, brush teeth can not be brushed horizontally, keep vertical brushing and rotating using toothbrush, you can choose fluoride toothpaste or desensitizing toothpaste, choose soft bristle toothbrush, pay attention to regular replacement of toothbrush. Pay attention to oral hygiene before going to bed, do oral health care regularly, timely detection, timely solution, so as not to cause serious defects, causing adverse consequences. Enhance the self science knowledge to prevent the occurrence and development of this disease. 3, for patients with more serious defects, compound tree ester or glass sub adhesive powder should be selected to fill the wedge-shaped defects to prevent the continued development. For those patients with severe defects combined with other complications, corresponding treatment treatment is required as appropriate.