Just over a year ago I had a root canal on a tooth. My insurance did not then cover a crown, so my dentist filled it, and I had no problems with it. My new insurance will cover a crown so a few weeks ago I went in, they put on a temporary crown, and again I had no problems with it. Last week I went for the permanent crown and was ok for a few days, but gradually it started aching. No sensitivity to hot or cold, but any pressure on it is terrible pain in that tooth only, not surrounding ones.