Dental neuralgia if pulp congestion, the source of the stimulus is removed, the pain usually disappears, if irreducible pulpitis occurs, it can not be self-healing, need to carry out root canal treatment to eliminate the pain, can not be accurately say a few days can be self-healing. 1. Pulp congestion: the affected tooth is subjected to hot and cold stimulation of the momentary pain response, the pain disappears after the removal of the stimulus, there is no spontaneous pain. If the pathogenic stimuli acting on the affected tooth can be removed, such as heat generation during cavity preparation, changes in air pressure, caries, etc., the pulp can gradually return to normal. 2. Irreducible pulpitis: the affected tooth has spontaneous pain, which can be caused or aggravated by hot and cold stimuli. At this time, the pulp has been localized or all the inflammation, can not be self-healing, need to eliminate the inflammation through root canal treatment to relieve pain. There may be other causes of dental nerve pain, it is recommended to go to the hospital in a timely manner, to clarify the cause of the disease for targeted treatment.