###Human: Do I compulsorily need a crown after root canal treatment? ###Assistant: Hi. Your first concern is regarding the number of days of your RCT. RCT can be done in a single session or 2 or 3 sittings depending upon the severity of your case. If there is severe pain or infection, the dentist may have to delay for treatment for 3 or 4 sittings. You should go for a permanent filling after RCT, which is mandatory. But, you definitely should wear a crown because your teeth are more brittle after RCT, so there is more chance to break off. You can go for a crown after six months once you make sure you have got no pain.