arrbbooker,
Sounds like it could be TMJ- Temporo-Mandibular Joint disorder. Symptoms can include joint pain when the jaw is moving, as when opening the mouth widely, chewing, or yawning, clicking, popping, cracking, or grating that is painful and occurs when opening the jaw and the jaw locking in an open or closed position or not opening wide. There are many different causes, and if you are like myself and had impacted wisdom teeth removed, it can also happen then. Please see your doctor. You can read more about it here
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