Yes, it is completely normal for the tooth to feel sore or tender when you bite down for a few days, and sometimes up to a couple of weeks, after a root canal treatment. This is part of the normal healing process as your jaw recovers from the procedure. You do not need to do anything special, other than continuing with your normal oral hygiene routine to keep the tooth clean. If the tooth feels tender, you can avoid chewing hard foods on that side until the tenderness subsides.