Dry socket after tooth extraction, especially after one of the complications of mandibular third molar extraction common in the histopathology showed alveolar wall osteitis or osteomyelitis minor limitations. Often in the extraction occurs after 2 ~ 3 d, due to severe pain and disruption of life for patients. The incidence reported in the literature varies, most reported to be 5% to 30%, its causes were not yet clear, so there is no very effective methods of prevention.
