Bruising under the tongue after tooth extraction may be caused by large surgical trauma when extracting complex teeth or wisdom teeth. Some difficult to extract complex teeth or wisdom teeth, extraction needs to be flap or split root surgery, surgical trauma, easy to cause swelling and inflammation of the surrounding tissues, postoperative bruising can be formed under the tongue, do not need to be overly nervous, it is recommended that ice packs on the face within 24 hours to maintain oral hygiene, and anti-inflammatory treatment, generally within 1 week can gradually recover. If there is bruising or active bleeding, you need to consult a doctor in time to inform the doctor, may be prophylactic anti-infective treatment, generally 1 week can gradually recover; active bleeding, often hemostatic treatment, such as compression hemostasis. It is recommended to go to the regular hospital stomatology department to visit the examination, do not be too nervous, such as dyspnea and other discomforts, timely consultation.