Q. One of my back teeth has recently git damaged and I was told by my dentist that I would need a crown. He sprayed the back tooth to see if the nerve was still active, and I nearly hit the roof as it was so painful, my dentist said he had to do that to see if the nerve was ok. My dentist has ground down the tooth ready for the crown, and Im due to have the crown fitted on Friday, but since yesterday I have had cronic pain around that tooth, it feels very nervy and painful, should I have had a root canal? and will it be ok to just add a crown over the nerve? Id hate to have a crown fitted and then suffer with this pain. Thanks,