I just saw a Dr who said my filling for the cavity broke off and it is important to fill it back before it reaches the root. Keep in mind I have no idea how this works. He couldn’t do the filling today. How urgent is the next appointment? I really don’t want to end up with a root canal.

Pain wise I can still eat, usually something hot or cold will give a slight discomfort but eases away. Just feels “sore” around that area after my cleaning. How soon should I schedule this? How can I avoid a root canal?