Swelling of the face after gum swelling and pain is a common symptom. The main cause of gum swelling and pain is poor oral hygiene, which leads to the deposition of dental plaque, dental calculus and soft dirt on the tooth surface near the gums, thus inducing gingivitis. Gingivitis needs to be treated with drugs. You can take amoxicillin, metronidazole and fenbid capsules orally, pay attention to rest and drink more water. The diet is mainly light, and spicy and stimulating food, greasy and fried food are prohibited. Pay attention to oral hygiene and form a good habit of brushing teeth in the morning and evening. After anti-inflammatory treatment, you'd better go to the hospital to see a doctor. The pericoronitis of the third molar wisdom tooth, also known as wisdom tooth pericoronitis, is due to the gradual shortening of the mandible in the process of evolution, and the lack of sufficient space when the third molar erupts, which causes the teeth to be completely buried in the bone or the crown of the erupted third molar to be covered or completely covered by the gums, forming a deep blind bag. Food residues should not be cleaned after entering the blind bag. In this case, anti-inflammatory treatment should also be carried out. It is suggested to conduct drainage and symptomatic treatment in the acute stage. The local area can be washed alternately with 3% hydrogen peroxide and normal saline, and the probe dipped in iodophenol to burn the blind bag. If accompanied by facial swelling, intravenous drip of broad-spectrum antibiotics plus metronidazole is required.