Yes: You can get a locked jaw from yawning. Yawning does involve opening the jaw to its maximum limit and at times the jaw joint can get "stuck" in that position. If it happens very infrequently and you do not have any pain, you do not need to seek any treatment. If its frequent, accompanied by pain or getting worse, you should contact an orofacial pain specialist. The management is usually benign.
Answered 11/1/2012
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