Can a successfully treated root canal tooth experience occasional pain/tenderness?

Sometimes root canal treated teeth, that we consider a success, do have some "low grade inlammation ". The teeth are not infected but are not entirely without tenderness.

Another possible explanation of continued symptoms it that some teeth have a small undetected crack and heavy chewing may cause some small movement of the the crack.

If symptoms are disturbing sometimes a retreatment of the root canal can cause the tooth to become less symptomatic. After all, most of our check radiographs are two dimensional and do not show the root canal system as it acutally is. Small discrepencies in the 3-D fill also may be responsible for symptoms.