Dry socket (Alveolarosteitis), also known as limited alveolar osteitis and fibrinolytic alveolitis, can occur in any extraction wound, with the highest incidence in the lower jaw after extraction of obstructed wisdom teeth, with an incidence of roughly 15%; it usually appears 2 to 4 days after surgery, after the blood clots in the socket have fallen off, the alveolar bone is directly exposed to the oral environment and the healing process is affected; the patient Pain, bad breath, and swelling occur in the extraction area. After tooth extraction, the alveolar socket where the tooth root was originally located should be filled by the blood clot and then gradually healed. For various reasons, the blood clot in the alveolar socket decomposes, destroys, falls off, and becomes infected 2 to 4 days after tooth extraction, resulting in the exposure of the bone wall of the extraction socket and the occurrence of multiple small foci of osteonecrosis, and small fragments of dead bone may appear. The patient presents with severe pain in the auriculotemporal or anterior region and radiates to the top of the head. On examination, it is found that the blood clot is dislodged in the extraction socket, the bone wall is exposed and is grayish in color, and it is very painful when the probe touches the bone wall. The treatment plan of dry socket: 1. Dry socket must be treated in time to avoid osteomyelitis of the jaw. 2. The principles of treatment for dry socket are pain relief, debridement, isolation of external stimuli, release of alveolar bone wall infection and promotion of normal granulation tissue growth. Under blocking anesthesia, the extraction wound is rinsed with 3% hydrogen peroxide solution and saline alternately, unhealthy tissues are scraped off with a scraping spoon, and the adhering corrupted necrotic material is completely removed, then iodoform gauze is placed in the alveolar sockets for pain relief and anti-inflammation; in the early stage of dry socket, after the local scratching is cleaned, after the blood clot fills the extraction wound area, the gauze ball can be directly used to re-bite and stop the bleeding; a small amount of iodoform can be added when placing it. The oil of clove can be added when placing iodoform, which has soothing, anti-inflammatory, analgesic and antiseptic effects and promotes the growth of granulation tissue. 4. Systemic use of antibacterial, anti-inflammatory and analgesic drugs. 5. Many dentists recommend the use of Yunnan Baiyao powder as a local filler for possible enlargement of the extraction wound, which can also treat and prevent the occurrence of dry socket; applying antibiotic ointment or filling with antibacterial agent or clove oil, etc. can also have certain effect. 6. In case of osteonecrosis and osteomyelitis of the jaw, the correct treatment should be taken: X-ray, scraping and debridement under local anesthesia, removal of necrotic bone tissue, hydrogen peroxide saline rinsing, and protection of fresh bone trauma. Preventive measures for dry socket: 1. Strengthen the doctor’s concept of asepsis. 2. Advocate minimally invasive tooth extraction, do not blindly expand the trauma during surgery, minimize trauma, minimize the extraction trauma after surgery, compress the buccal and lingual bone plates to reset them to reduce the trauma, and draw together the gums and suture them, and pay attention to not over-tightening and over-density when suturing to prevent postoperative swelling. 3. Appropriate antibiotics can be used before and after tooth extraction to prevent infection. 4.After tooth extraction, you should act according to the doctor’s instruction, and it is strictly forbidden to brush teeth, rinse mouth, spit and tongue touch the wound within 24 hours after tooth extraction to protect the blood coagulation in the extraction sockets quickly and reduce the possibility of dry socket. 5. Try to eat soft food before wound healing, avoid chewing on the side of tooth extraction, pay attention to the cleanliness and hygiene of diet, rinse and brush teeth with light salt water. 6. Smokers are more likely to develop dry socket, so it is recommended to quit smoking for 2~3 days after surgery. 7, Try to remove the residual granulation tissue and excessive bone tip protrusion at the apices of the affected teeth. 8. Extraction is not recommended during severe cold or when the physical or mental condition is poor, especially for the more difficult posterior teeth.