I had a root canal & crown in May. My tooth continued to hurt, radiating to the jaw, as well as the gum tissue at the new crown site. Saw my dentist & it was decided I needed a mouthguard. The xrays showed my tooth was fine. I have been trying to wear the mouthguard for about 2 weeks now & it seems my tooth hurts more than ever. I've had adjustments done on the mouthguard. I can't seem to bite on that side and it hurts more when I tap the top of it. Why am I having this pain and it's worse now?