One month after the extraction of teeth can not open the mouth, may be trauma caused by the surrounding chewing muscle spasm, or after the extraction of improper care caused by temporomandibular joint disorders and other factors, according to the cause of the general treatment, drug treatment, surgical treatment and so on. 1.Chewing muscle spasm: due to the special position of the tooth, the trauma of extraction is large, facial swelling and difficulty in opening the mouth are normal phenomena after the operation, and the symptoms will be reduced in about one week after the operation. Difficulty in opening the mouth is mainly due to the trauma and traumatic inflammation of the temporal muscle deep tendon lower section and internal pterygoid muscle, reflexive muscle spasm, the treatment is mainly localized hot compresses and physiotherapy, exercise in opening the mouth. 2. Temporomandibular joint disorder: if the tooth extraction difficulty, trauma, patients open their mouth for a long time, local temporomandibular joint injury pain, because of the pain and can not open their mouths, resulting in limited mouth opening, can eat soft food, avoid biting hard objects, local heat physiotherapy, pain is obvious can be followed by the doctor’s orders orally ibuprofen and other pain relief. For the symptoms of the extraction of the mouth, should be timely consultation, and timely targeted treatment, so as not to affect the normal eating, chewing, etc., but in the treatment before the need to consult a professional physician.