If you are experiencing severe pain in a tooth, then suddenly, the pain goes away, do not consider this a sign of healing and decide to cancel your visit to your dentist. Toothache results from inflammation of the nerve inside the tooth, and this inflammation doesn’t go away on its own. If you are experiencing severe pain in a tooth, then the pain suddenly disappears, this means that the inflamed nerve causing the pain is starting to be non-responsive. Eventually, the nerve will die, resulting in the loss of sensation in the tooth.  However, even if the nerve dies, the disease will still progress inside the tooth, so you must visit your dentist. If left untreated, it will progress and eventually require a more complicated treatment.