Dry socket is prone to occur during wisdom tooth extraction, especially in the lower jaw where the extraction of obstructed wisdom teeth is more traumatic and has a higher chance of occurrence. The blood clot covers the alveolar socket after extraction and protects it from bacterial infection. If the clot is inadvertently dislodged, the exposed alveolar bone is prone to decay and necrotic changes under bacterial infection, secreting grayish-white mucus and emitting foul odor, causing enlargement of local lymph nodes and generalized fever, chills, aches and pains, weakness and other symptoms. The treatment requires thorough removal of necrotic tissue from the alveolar sockets under local anesthesia, and after rinsing with hydrogen peroxide solution, filling and replacing iodoform gauze to promote the generation of new tissue.