Swollen teeth are related to the following conditions: 1, during tooth eruption, food residues are easily retained, producing eruptive gingivitis, such as when wisdom teeth erupt, the gums of the distal middle of the second molar will be significantly swollen, and when wisdom teeth and distal middle gums form periodontal pockets, it will cause bacterial infection and cause swelling of the cheek; 2, when there is a large amount of calculus attached to the cervical part of the tooth and subgingival area, it will produce inflammatory secretions and cause soft tissue swelling; 3, when periapical periodontitis occurs, inflammatory exudates will destroy the alveolar bone and penetrate the bone wall causing swelling; 3.When periapical periodontitis occurs, the inflammatory exudate from the root tip will destroy the alveolar bone and penetrate the bone wall causing swelling of the gums; 4.When the tooth is obviously loose, the periodontal membrane gap widens and is easily invaded by bacteria, causing swelling of the surrounding gums.