A dislocation of the mandible leads to excessive opening of the mouth with only the most teeth after contact. If the median line of the mandible is deflected to one side, the dislocation is unilateral. The injection of a local anesthetic (e.g. 2 to 5 ml of lidocaine 1%) in the articulation of the same side and in the region adjacent to the insertion of the lateral pterygoid muscle can reduce spontaneous the mandible. Reducing manual intervention may be needed. Premedication with diazepam 5 to 10 mg IV or midazolam 3 to 5 mg IV and an opioid (e.g. For an adult of average weight, meperidine 25 mg or 50 mg IV IM) is desirable but not absolutely necessary, especially if the preparation of IV solution lasts longer. Over time dislocation of the mandible is long, the reduction will be more difficult and more likely that this becomes a chronic problem is large. To remove the patient's head must be stabilized. The doctor put his thumbs on the external oblique line of the mandible (outside of wisdom teeth) and the other fingers under the chin. A rocking movement is vested with the thumbs down and forward while the other fingers grow up until the jaw returns to its place. The jaw is held in position by a chin sling. The patient should avoid large open mouth for at least 6 weeks. When the patient feels the onset of a yawn, he must put his fist under his chin to avoid opening too big mouth. If it is repeated, the patient will be addressed in consultation with a maxillofacial surgeon. Surgery may be necessary to tighten the elements that surround the temporomandibular joint or reduce the articular eminence.