The swelling and pain of the back tooth is an indication that the tooth suffers from periodontal inflammation, pulpitis or periapical inflammation, due to the infection of the bacteria present in the mouth, you can take antibiotics in moderation to reduce inflammation, such as oral cephalosporin capsules of the first or second generation, amoxicillin dispersible tablets, erythromycin enteric capsules and metronidazole tablets, but the tooth has to go to the clinic for specific examination and treatment, simply by using the method of oral anti-inflammatory drugs, can not The problem of tooth pain cannot be solved at the root. If the tooth has periodontitis or periodontal abscess, the periodontium should be flushed with medicine and treated with ultrasonic scaling or even periodontal scaling. If the tooth is swollen and painful due to pulpitis and periapical inflammation, root canal treatment will be done to solve the root cause of the tooth pain.