Hi,
As a result of my firsthand experience with this subject, I would recommend going to an endodontist to advise and if necessary to perform the root canal on any back molar....
She showed me the xray. The cavity wasn't to the nerve yet, my nerve is not infected in any way.
I have to get a crown too, how is that uncomfortable?
I just had a root canal - often times the tooth doesn't hurt but if the nerve has been exposed or damaged, you need to have it because the risk of infection is too great. Ask the dentist to show you on the xray why you need to have it done - sometimes there is a little cloud at the top of the nerve that shows an infection that you cannot feel.
Root canal is slightly more uncomfortable than a filling - take some motrin beforehand. Otherwise it wasn't too bad. Having a crown was way more uncomfortable.
GL!