The nerve endings are all removed from the inside of the tooth is a root canal, so the tooth will no longer have any sensation. But the surrounding tissues could still be somewhat inflamed, depending on how bad your situation was prior to coming in for your root canal. It could take a few days for these tissues to fully calm down after your root canal, although the pain should quickly decrease. Also, your jaw could be a bit sore after being open for the time necessary to perform your root canal, but this is soreness and not acute pain and is easily manageable.