I am a dental assistant & wanted to let you know that you should not be having any pain in that same tooth that you had a root canal done on. A root canal is where the nerves are taken out of the tooth so you don't have anymore pain. We don't put a crown on that tooth immediately after a root canal, because we wait to see if you are still going to have any pain or not. Feel free to email me with any questions as I can find out from the Dentist I work for & see what suggestions he may have. My email is katy214@yahoo.com