As the saying goes, toothache is not a disease, but a pain that kills you. Toothache is indeed unpleasant and people can determine what kind of dental disease they have based on the different manifestations of toothache. Persistent pain Persistent pain in the gums that can be clearly localized, with a floating sensation in the teeth and significant pain from knocking on the teeth or biting on objects. It indicates that the inflammation has invaded the root tip. The principle of emergency treatment is “decompression and drainage”, in which a hole is made in the middle of the tooth to allow inflammatory secretions to flow out and reduce the pressure in the pulp chamber. After taking X-rays, root canal treatment or plastic surgery will be chosen according to the condition. ”Pain at the root of the tooth (wisdom tooth, third molar) The pain at the root of the tooth (wisdom tooth, third molar) is constant, and the pain increases when touching the gums. Cold, hot, sour and sweet pains The pain disappears when the tooth is exposed to cold, hot, sour or sweet. Teeth with pigmentation, usually caries. There is no pigmentation on the tooth surface of gum edge, and it is deep wedge-shaped defect. Both dental diseases are mild and can be improved by restorative treatment. However, if the dentin sensitivity is caused by gum recession, etc., the treatment process is more complicated. Painful gums Persistent pain in the teeth with redness, swelling, looseness, and mostly with symptoms of food impaction is a manifestation of periodontitis. Painful biting of hard objects Painful biting of hard objects, with a history of knocking on stones and other hard objects. There may be cracks in the tooth, and in severe cases, the tooth may crack. Depending on the depth of the occluded crack, decide the treatment plan: if the tooth is loose, extract it. If it is shallower, it can be preserved with a crown set. Spontaneous paroxysmal pain Spontaneous paroxysmal pain in the gums, which cannot be localized and increases when sleeping; pain can be induced by cold or hot stimulation, and the pain continues for some time even after removing the stimulus, and the pain radiates to the auriculotemporal region. This indicates inflammation of the tooth pulp and treatment of the “rotten nerve” is necessary. After removing the “rotten nerve”, root canal treatment is performed.