Dry socket is one of the serious complications after extraction of wisdom teeth and complex teeth in oral and maxillofacial surgery, most often occurring in the mandibular blocked third molars (wisdom teeth). 2. The extraction wound is empty and covered with a layer of decayed material, which has a special foul odor, and the alveolar bone in the extraction wound is exposed and extremely sensitive, which can cause severe pain when gently wiped or stimulated by cold water. Since dry socket often causes great pain to patients, corresponding prevention work should be done after wisdom tooth extraction. At present, antibiotics, anti-inflammatory and antiseptic analgesic drugs are mostly placed in the wounds of tooth extraction, and Chinese herbal powder or paste can also be tried to fill the wounds.