It depends on your dentist. Mine puts an antibiotic ointment into the tooth before the rods and before he puts either a temp or permanent crown on. I have had a ton of root canals done. All my molars are crowned. The bad thing is with crps my jaw bone on the bottom is shifting some so my teeth arent aligned right anymore. I am almost to the point of telling them to sedate me and pull them. I haven't quite gotten there though. Plus I'm not sure if my dental coverage will cover it.