Most of the tooth pain is caused by acute pulpitis, acute periapical inflammation or dental trauma, which cannot be cured by itself and needs to be treated professionally. 1. Acute pulpitis: acute pulpitis is a more serious inflammatory lesion of the dental pulp, belonging to a kind of irreducible pulpitis. The main manifestation of the affected teeth of spontaneous paroxysmal pain, pain at night, temperature stimulation can aggravate the pain, and the pain can not be localized and other obvious pain. Acute pulpitis patients need to actively seek medical treatment to open the pulp drainage, root canal treatment, etc., can not be self-healing. 2. Acute periapical inflammation: acute periapical inflammation is a series of reactions from the apical periodontal membrane plasma inflammation, to the formation of periapical tissues purulent inflammation. The main manifestation of the affected tooth has a floating sensation, knocking or chewing can lead to severe pain in the affected tooth, the pain is spontaneous persistent throbbing pain. Need to actively seek medical treatment for pulp drainage, incision and drainage of pus, root canal treatment, etc., but also can not be cured. 3. Dental trauma: dental trauma tooth looseness is not big, let the tooth get enough rest is possible to heal itself, but there is a big loosening, you need to loosen the tooth fixation, root fracture can not be retained need to be extracted.