There are various causes of swollen gums, broadly speaking, as follows: the first, periapical abscess, when the affected tooth will have an elongated feeling, and the teeth will contact first when biting, with obvious percussion and biting pain. The second, periodontal abscess, is due to periodontitis that forms periodontal pockets overflowing with pus, which can form periodontal abscesses in parts of the gums if there is poor drainage. The third type of periodontitis, because the eruption of wisdom teeth is not complete, so in the far of the wisdom teeth will be covered with gingival flap, forming a blind pocket, the blind pocket often embedded in the food residue, resulting in food fermentation, will produce swelling and inflammation. The fourth, gingivitis, is due to plaque and calculus long-term stimulation resulting in inflammation of the gums. Therefore, it is important to go to the dentistry department of a regular hospital for a meticulous examination, and only a clear diagnosis can make the most correct treatment.