Are redone fillings supposed to hurt for a while?

Fillings: First time or redone ones can be somewhat sensitive in the beginning. The bigger the filling and the deeper the filling, along with a low pain threshold tend to cause the most post-op discomfort. Your own dentist is the best one to ask as to what to expect and for how long.

Can be normal: Some teeth do become sensitive after being replaced. No one is really sure why this happens. It could be more from irritating the pulp tissue by disturbing residual.