Numbness in the upper two teeth may be caused by dental caries, periodontitis or trauma, which needs to be treated with root canal, periodontal, medication or observation. 1. Caries: Numbness of the upper two teeth may be due to dental caries, caries close to the pulp of the tooth can produce numbness or discomfort to external stimuli, generally after resin filling symptoms will slowly disappear, if the caries progressed to the pulp cavity will be pain and other symptoms of discomfort, you need to carry out root canal treatment. 2. Periodontitis: when oral periodontitis, gum recession root exposure, easy to cause dentin sensitivity, soreness, numbness and discomfort, generally need to carry out periodontal treatment, gingival cleaning treatment under the gingival cure scraping, if necessary, root planing, elimination of gingival inflammation, and at the same time the local use of strontium chloride and other drugs to seal the dentin tubules, to solve the symptoms of dentin sensitivity. 3. Trauma: when the teeth are hit by external forces or bite hard objects caused by tooth shock or tooth fracture, the teeth will also appear numbness, generally reconcile and fixation and observation, the emergence of pulpitis symptoms, the need for root canal treatment. When any discomfort occurs in the teeth in the mouth, it is recommended to go to the hospital in time to avoid affecting oral health.