Wisdom teeth extraction is a surgical procedure, which is defined as an invasive operation performed locally on the human body by a medical practitioner applying instruments associated with surgery for the purpose of removing diseased tissue, repairing tissue damage, transplanting an organ, or relieving pain. Wisdom teeth extraction surgery is a way of removing diseased teeth, so not only wisdom teeth extraction, including all clinical tooth removal, can be considered as surgery. Only that there are big and small surgeries, wisdom teeth extraction is one of the relatively big ones, especially for the removal of ambulatory blocked teeth, which may involve anesthesia, incision, flap, debridement, division, extraction, suture and so on during the operation, so it is a kind of surgery.