Whether swelling will occur after tooth extraction depends on the size of the extraction trauma. If it is a clinically simple tooth extraction, such as the extraction of a third degree loose tooth or the extraction of a child’s milk tooth during the period of alternation between milk and permanent teeth, such tooth extraction will not cause local swelling after the operation due to the relatively small trauma. If the extraction of the more complex buried wisdom teeth is involved, the extraction process involves a series of operations such as flap cutting, bone removal, tooth division and suturing, etc. Due to the large trauma of the extraction itself, the process of physiological swelling will occur after the operation, and the swelling process will reach its peak in 2-3 days after the operation, and then gradually dissolve, which will be completed in about 7 days after the operation.