Sore incisors can be caused by the decay of incisors, which can lead to the loss of hard tissues of teeth and the exposure of dentin, thus causing the symptom of dentin hypersensitivity. When eating cool, hot, sour or sweet food, the incisors will become sour. In this case, treatment of dental caries should be carried out to grind out the discolored and infected hard tissues, and then composite resin filling material should be used to restore the shape of the teeth. If the fissure is deep enough to reach the pulp, then root canal treatment should be done first. In this case, the periodontal inflammation should be controlled and systematic periodontal treatment should be done, mainly including ultrasonic scaling, periodontal rinsing and drugging, surface polishing and periodontal scaling.