Tooth soreness is supposed to be a condition of dentin hypersensitivity, which refers to the soreness of teeth caused by external stimuli, such as temperature cold, heat, chemical stimuli, acid, sweet, and mechanical action friction or biting hard objects. It is characterized by rapid onset, sharp pain and short duration. In the clinical treatment of similar problems, drug desensitization is feasible: i. Fluoride. 75% sodium fluoride glycerin, local rubbing 1-2 minutes, ii. Strontium chloride. 10% strontium chloride in toothpaste, or 75% strontium chloride glycerin and 25% strontium chloride liquid local rubbing. III. Ammoniacal silver nitrate. Spaced wet, blow-dried, and rubbed. Clove oil reduction to black, operation do take care not to burn other oral mucosa soft tissue. Fourth, silver iodide. 3% tincture of iodine for half a minute, 10%-30% silver nitrate for half a minute, producing gray-white silver iodide. Five, laser. Power 15 watts, irradiation of sensitive areas for 0.5 seconds each time, when to 20 times for a course of treatment. Other drugs 4% magnesium sulfate solution, 5% potassium nitrate solution, 30% potassium oxalate solution. Sixth, periodontitis caused by gingival recession, root exposure can lead to chewing weak teeth soreness. At this time should also be desensitization treatment of the affected teeth.