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A broken jaw (or mandible fracture) is a common facial injury. Only the nose is broken more frequently. A broken jaw is the 10th most common fractured bone in the human body. Fractures (breaks in the bone) are generally the result of a direct force or trauma to the jawbone (mandible). A dislocated jawbone means that the temporomandibular joint (where the jaw connects with the skull) is moved out of place.
What is a mandibular dislocation? A mandibular dislocation is the separation of your mandible (lower jaw) from your temporomandibular joint (TMJ). When this happens, your lower jaw does not go back in place on its own. What causes a mandibular dislocation? Opening your mouth too wide: This may happen when you laugh, yawn, sneeze, take large bites, or vomit. Some open mouth or dental procedures may weaken the muscles around your TMJ and lead to dislocation. Tooth problems: Teeth that are missing, worn, or not lined up correctly can prevent your jaw from working correctly.