The swollen gums of a tooth may be caused by periodontitis, gingivitis, apical periodontitis and other diseases, patients can take medication, surgical treatment and other treatment measures. 1. Periodontitis: For the gums of a tooth swollen due to periodontitis, patients can take oral amoxicillin capsules, amoxicillin clavulanate potassium capsules and other penicillin antibiotics as prescribed by the doctor, but also oral minocycline hydrochloride capsules, doxycycline hydrochloride capsules and other tetracycline antibiotics, as well as metronidazole tablets, tinidazole tablets and other nitroimidazole antibiotics. At the same time, patients also need to carry out systematic periodontal treatment such as cleaning, scraping, in addition, patients can also be surgical treatment after the symptoms of swelling and pain relief, such as guided tissue regeneration, flap surgery, dental implants and other surgical procedures. 2. Gingivitis: Gingivitis can also lead to symptoms of swollen gums on one tooth, patients can use cotrimoxazole gargle under the guidance of the doctor, which has antibacterial effect and can relieve the patient’s discomfort. In addition, if the patient’s discomfort disappears and the gums do not return to normal, surgical treatment can be taken, mainly for gingivoplasty. 3. Periapical periodontitis: For swollen gums of a tooth caused by periapical periodontitis, the patient needs to undergo a perfect root canal treatment in order to be completely cured. The patient in the appearance of a tooth gums swollen symptoms, should consult a doctor in a timely manner, the use of drugs need to follow the doctor’s instructions.