Bad tooth pain may be caused by caries, pulpitis, apical periodontitis, etc. According to the situation, choose filling and repair, root canal treatment, extraction and other treatment measures. 1. Filling and restoration: middle caries tooth will appear sweet and sour stimulation pain, you need to clean up the decayed tooth tissue, and then fill the tooth; deep caries tooth will appear hot and cold stimulation pain, you need to clean up the decayed tissue, and then fill the tooth after cushioning. 2. Root canal treatment: teeth with pulpitis will have pain at night and spontaneous pain, and teeth with periapical inflammation will have biting pain, the best way to deal with this is to carry out root canal treatment, so that the inflammation of the tooth is completely eliminated, and the symptoms of tooth pain will be gradually relieved. 3. Tooth extraction: tooth decay only left the root and absorption, tooth retention is not significant, in this case it is best to extract the tooth, later for dental implants or other prosthetic restoration. Bad tooth pain in time to the hospital, clear cause after active treatment, so as not to aggravate tooth pain.