Subcutaneous emphysema and pneumomediastinum following extraction of mandibular third molars are rare. These complications are caused by forceful injection of air into the connective tissue. The symptoms may vary depending on the quantity of air, its location and the presence or absence of infection. In most cases, the subcutaneous emphysema will begin to disappear in 3-5 days. This report presents a case of subcutaneous emphysema and pneumomediastinum after wisdom extraction.