I've had 2 root canals done. The 1st took about 1 week to settle down, was fine for about 6 months and now I get a bit of sensitivity from it every 3 or 4 days. The 2nd ached for 2 weeks. I went on a course of antibiotics and it seemed to get better. About 2 months later it hurt like hell and I went back. My Dentist said all he could do was take it out, but that it sometimes takes 2 or 3 years for a root canal to settle! Currently this one is OK, but my first one is giving me bit of (bearable) pain. My advice is, don't expect everything to be hunky dory, but hope that it is.