I had a root canal without any novocaine because tooth was dead. It did not hurt & was just a little sore for a couple of days afterward. Then about 3 days later I started getting a throbbing pain in my gum above the tooth & it really hurts to bite down on that tooth. I went back to the dentist & was given antibiotics & pain medicine even though the x-ray didn't show infection or a cracked tooth. It's been 3 days & it still really hurts. It seems like the pain is going up my gum under my nose.