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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.
The jawbone, known as the mandible, fits into a joint on each side of the head (temporomandibular joints or TMJs) and becomes dislocated when the bone slides out of these joints. A dislocated jaw may be caused by forceful yawning or by an impact or force, such as being punched in the face or being in a car accident. Other activities that can lead to a dislocated jaw include laughing, vomiting, singing, eating, and even dental treatment. A dislocated jaw is painful and may make it impossible to close your mouth. You may notice that your teeth do not align normally or that your lower jaw seems to be further forward than usual.