Note: (Video has been recorded with informed consent) Open lock means your jaw is stuck open and you can't close it usually due to the TMJ (temporomandibular joint) slipping out of place. Causes: Wide mouth opening (yawning, laughing, dental work) TMJ weakness or lax ligaments Jaw trauma or dislocation Joint disorders (TMJ dysfunction, arthritis) Treatment: Immediate care: Don't force the jaw; go to a doctor or dentist. Manual reduction: A doctor repositions the jaw back into the joint. Pain rel