A dislocated jaw (dislocated mandible) generally is very painful. The mouth cannot be closed, and the jaw may be twisted to one side.
A dislocated jaw is occasionally caused by an injury but is typically caused by opening the mouth excessively wide (such as during yawning, biting into a large sandwich, vomiting, or during a dental procedure).
Dislocation is more likely to occur in people who have had previous dislocations or who have looseness of the jaw (hypermobility), which may result from temporomandibular disorders.
► See also: ORAL MEDICINE : TMJ disorder symptoms & therapy
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