Does temporomandibular joint disorders or jaw cracking change what your jaw looks like from the outside?

Possible: It can change the look of your face but that is in severe cases. Severe TMJ can lead to resorption of the joint bone changing the angle of the lower jaw.

Not generally, no.: Tmj disorders, or temporomandibular disorders, generally don't change the shape or appearance of the jaw unless advanced degenerative changes occur in the joint. If the joint severely deteriorates, as in advanced osteoarthritis, then that can cause the jaw to shift downward and backward, causing the angle of the jaw to increase and possibly creating an anterior open bite.

Rare: Rare. Almost never. If you do have a change, may be something more serious. See oral surgeon.