Hi Jennifer, Just out of curiousity, would a misplaced crown cause a tooth to throb? I ask because like rc1975, I also had throbbing and pain and no one even suggested the possibility of a crown issue. The endodontist also saw nothing on the xray. Since my first root canal last summer, I have had a retreatment and an apico. I would hate that I had all that done, when it was just a crown issue. How could they tell the difference? Thanks.