Incisors that is, incisors, incisors are usually sore and tender caused by dentin hypersensitivity, wedge-shaped defects, gingival recession, abrasion, etc. may lead to the occurrence of dentin hypersensitivity, as follows. 1. Wedge-shaped defect: improper brushing, acid in the gingival sulcus and non-central bite force may cause wedge-shaped defects in the neck of the teeth, when the depth of the damage reaches the dentin layer, when encountering hot, cold, sweet and sour stimuli, dentin sensitivity symptoms can occur. 2. Gingival recession: the neck of some teeth is neither covered by enamel nor bone, and when gingival recession occurs, dentin is exposed and dentin sensitivity symptoms may occur. 3. Wear and tear: Improper brushing, bad biting habits, night grinding, etc. may cause wear and tear of the teeth and exposure of dentin, resulting in dentin hypersensitivity symptoms. There may be other reasons for dentin hypersensitivity in incisors, so it is recommended to go to the hospital in time to clarify the cause of the disease and then carry out targeted treatment.