Awoke with pain in my lower left jaw near a filling I had done when I was 17. No sign of an abscess on the outer gums. When I run my tongue or finger along the inside of my jaw, it is quite tender and sore. When I push under my jaw with my fingers I can feel a small lump. So far I have been taking advil for the pain and inflammation. Is this a sign for a root canal or just an infection?