Dry socket is a common complication after tooth extraction. The cause of this condition is mainly related to the long operation time of surgical trauma and the absence of blood clots in the extraction sockets, which leads to the entry of food residues into the sockets and causes microbial infection, and can induce severe pain at the same time. Some people may confuse the dry socket pain with the common pain after tooth extraction, causing neglect of the disease and delaying treatment. Therefore, it is necessary to learn to distinguish between these two types of pain. The difference between dry socket pain and ordinary pain mainly lies in the following aspects: 1. Pain level: ordinary pain is usually more severe just after tooth extraction, but with the progress of time, the pain will slowly subside and most people can tolerate it. In contrast, the pain induced by dry socket is often more severe, and most patients have difficulty in tolerating it, and are often found to suffer from it because of the severe pain in the hospital. 2. In contrast, the pain of dry socket usually starts to appear 3-4 days after tooth extraction and presents continuous pain, which gradually increases with the progress of time; 3. The pain of dry socket, on the other hand, will be radiating in addition to the affected area, and will mainly radiate to the auriculotemporal area; 4. In contrast, dry socket is often accompanied by oral odor, which may be caused by a small amount of corrupt, foul-smelling blood clots or by the decay of food residues embedded in the socket.