Jaw lock is a surprising and painful condition that happens when your jaw slips out of place, often after a big yawn or opening your mouth too wide. This is called temporomandibular joint (TMJ) dislocation, and it can make moving your jaw really uncomfortable or even lock it altogether. If you’ve ever experienced this, you know how annoying and scary it feels! But no worries, understanding why it happens and how to avoid it can save you a lot of trouble. Opening your mouth with too much strain i