Yes! Root canals like any other restoration are not permanent. You can still get infections in the root canals which will mean you will need that area retreated with another root canal. Usually you...
tooth may be sore for several days after filling. Pain relievers, such as ibuprofen (Advil, Motrin) may be taken to ease the soreness. The tissues around the tooth may also be irritated. Rinsing the...
from
http://wiki.answers.com/Q/Does_a_root_canal_hurt
I can only speak from my experience but I had a root canal done on a molar 2 years ago and it was easier than a lot of fillings I've had done....