Most of the dry socket appears 2-3 days after tooth extraction, and if it does not appear in 1 week, it is very unlikely to have dry socket. Dry socket, also known as alveolar osteitis, usually presents as severe pain 2-3 days after tooth extraction, radiating to the auriculotemporal region, the top of the head and the jaw area, often accompanied by a putrid odor and systemic symptoms such as fever and swollen lymph nodes, which cannot be relieved by general pain medication. The etiology of dry socket is not clear at present, and it is generally believed that it may be related to factors such as infection of the extraction wound, oversized extraction wound, poor local blood supply, etc. Smoking, incorrect extraction method, low immunity, and old age may easily induce it. It is recommended to pay attention to rest after tooth extraction, not to smoke, avoid strenuous exercise, and not to eat excessively hot or spicy stimulating food to reduce the chance of wound infection. If similar symptoms of dry socket occur, it is recommended to seek medical attention for debridement treatment in a timely manner.