Tooth sensitivity and tenderness may be caused by wedge-shaped defects, over-abrasion of the teeth, or fissures. Depending on the situation, desensitization treatment, resin filling, or root canal treatment may be performed. 1. Desensitization. Tooth sensitivity and tenderness is often caused by dentin sensitivity, which may be caused by wedge-shaped defects, tooth abrasion or fissure, and if the symptoms are mild, you can use strontium chloride and other medications to desensitize and seal the dentin tubules to reduce sensitivity. 2. Resin filling. For teeth with large wedge-shaped defects, resin filling can be used to isolate external stimuli. 3. Root canal treatment. Root canal treatment should be considered if the tooth is overly worn or if the defect is deep and the symptoms are severe. Tooth sensitivity and acidity is recommended to go to the hospital for examination and treatment in time to avoid pulpitis.