An abscess on the root of a tooth usually cannot be resorbed by itself. The presence of pus in the root of the tooth suggests that there is inflammation in the root of the tooth, and upon examination of the tooth surface there is often a large caries, at which time the pulp is necrotic and the inflammation spreads to the periapical tissues. Most of them cannot subside by themselves, and need to control the inflammation in the pulp cavity and periapical area through root canal treatment, and at the same time use antibiotics such as metronidazole tablets to control the inflammation of the periodontal tissues, so that the abscess can be eliminated. It is recommended that an annual oral dental examination should be conducted to avoid tooth decay triggering pulpitis spreading into periapical periodontitis, apical cyst, apical abscess and other diseases. If you find an abscess on the root of the tooth, the patient should go to the hospital stomatology department in time for examination and active treatment, so as not to delay the aggravation of the condition.