The peak of local swelling and pain that may usually occur on the third day after wisdom tooth extraction is due to the fact that patients experience varying degrees of soft tissue swelling after surgery, which is normal. Since wisdom teeth are often buried between the buccal alveolar bone and lingual alveolar bone, the procedure is long, traumatic and prone to secondary infection. Clinical experience shows that the degree of postoperative swelling is related to the amount of intraoperative debridement and postoperative wound suturing. Therefore, in order to reduce the postoperative pain of patients, local injection of dexamethasone is often added on top of lidocaine anesthesia for those with deep wisdom teeth and large expected bone debridement. Generally, the swelling and pain symptoms start to relieve three days after surgery, and patients can take oral anti-inflammatory drugs such as amoxicillin, cefixime, cefuroxime, metronidazole, roxithromycin, or analgesic drugs such as ibuprofen and loxoprofen sodium under the guidance of the doctor. Also avoid touching the wound with your hand or tongue to avoid infection. Diet should avoid spicy, stimulating, greasy food and tobacco and alcohol, with warm, easily digestible noodles, porridge, lotus root powder and other liquid or semi-liquid food as the main food. If the patient has severe pain after wisdom tooth removal and spreads around the wound, it is considered to be dry socket, i.e. alveolar osteitis, as a complication after tooth extraction. Although the exact etiology is not yet clear, it occurs after wisdom tooth extraction in the lower jaw and requires a thorough debridement with the aid of oral pain medication and antibacterial drugs. Dry socket is self-limiting and usually does not develop into a serious complication, so patients only need active treatment.