The neuralgia caused by tooth decay, that is, the deeper caries has caused the symptoms of nerve, there are two cases: First, the tooth decay has not penetrated the nerve yet, but there is already a slight symptom of nerve, soothe and observe for the nerve, try your best to clean the decayed part, put the pad of soothing medicine for the nerve part, apply the temporary medicine to close up the nerve, observe for a period of time, if the nerve gradually recovers If the nerve gradually recovers, it is called reversible pulpitis and the nerve has reached a more normal state, the temporary restoration can be removed and replaced with a permanent restoration, and the treatment is completed. Second, the nerve has irreversible damage, the need for targeted system root canal treatment, and then do metal porcelain crowns to protect the tooth.