The flesh behind the tooth is swollen and painful for several days, it may be due to periodontitis, apical periapical inflammation, pericoronitis, etc., which can be treated by general treatment, oral medication, local treatment and other measures. 1. General treatment: pay attention to oral hygiene, eat a light diet, gargle with salt water and brush your teeth on time. 2. Oral drug treatment: acute infection can take metronidazole, cefadroxil and other antibiotics anti-infection treatment; serious pain can take ibuprofen, diclofenac sodium and other drugs. The medication should follow the doctor’s instructions. 3. Local treatment: if there is apical periapical inflammation need to take root canal treatment; if there is tooth decay should be actively cleaned and filled; if it is wisdom teeth pericoronitis, it is recommended that the local rinsing medicine, infection control and timely extraction; periodontitis need to be scaling. The flesh behind the tooth is swollen and painful for several days, you need to go to the hospital in time to check, follow the doctor’s instructions for standardized treatment.