Dry socket is a symptom of jaw infection that occurs after wisdom tooth removal. Its clinical symptom is a sudden worsening of pain 2-3 days after removal, radiating to the head, ear-temporal and mandibular regions, and the patient may even feel a foul odor in the mouth. This is clinically called dry socket syndrome. In fact, the pain of dry socket is not easy to control, and even oral pain medication can not be relieved. Clinically, the doctor will find that the extraction wound is dirty, there are some decayed necrotic materials, and even some decayed necrotic smelly tissues. Dry socket syndrome often occurs in patients with weaker physique, or patients with longer operation time. Oral antibiotics are given to prevent dry socket. How to identify dry socket, in fact, is after the extraction of teeth, was a kind of mild pain, but in 2-3 days after the extraction of teeth, this pain suddenly in the local aggravation, and even to the surrounding radiation. In this case, we should highly suspect the occurrence of dry socket, we should go to the hospital in time, to the extraction doctor for consultation, let the doctor as soon as possible to deal with, so as to alleviate the pain. This is because dry socket can last for 1-2 weeks if left untreated.