The root of the tooth swollen a bag may be due to apical periodontitis caused by fistula, may also be caries caused by gum abscess, need to choose the corresponding treatment to relieve. 1. Periapical inflammation: when the patient’s pulp necrosis is not treated in time, resulting in periapical inflammation, it is easy to cause periapical entry infection, you can see the root tip through the radiographs have a shadow, need to carry out root canal treatment. 2. Dental caries: If the patient has dental caries in the mouth, not timely treatment, food congestion, stimulate the gums, the formation of gingival abscess. Usually, the treatment includes local rinsing and medication, removal of carious tissues, and resin filling treatment. Patients with radiculopathy should pay attention to oral hygiene in daily life, rinse the mouth after meals, reduce the intake of sweets, and consult a doctor when abnormalities occur.