Restylane is fantastic for facial injections, especially in the lips. If you are having pain in the jaw I would return to your treating physician for examination. Some soreness locally after injection is normal but pain needs to be evaluated immediately. For the best cosmetic results please consult a board certified dermatologist with a great deal of experience with facial injections.
It is common to have some tenderness for a day or 2 after injections but if you are having pain, I would call the doctor who performed the treatment and have them check it.
I would advise you to call your injecting physician and see if they can take a look. Most likely it is coincidental but it sounds like something that should be evaluated.