I've had a root canal treatment on a tooth for the second time-the first root canal was three years ago-I was suffering with tenderness above the tooth for over a year, had my dentist check it and he couldn't see anything on x ray-about six weeks ago I had an infection in the tooth and had to have the root canal re-done-after my dentist had drained the infection, the pain subsided after a day or so and completely went after a few days. I went back to my dentist for the second part of the root canal, he cleaned everything out and put a temporary filling into the tooth and made an appointment for four weeks later. I had no problems or pain during this period. I returned to my dentist to have the root canal completed-this was done without any problems, although a week or so later, i'm getting tenderness again at the root of the tooth, and I can feel it if I press with my finger. I don't have a problem with eating or drinking, and haven't had to take pain killers-The tooth isn't right, and i'm not comfortable with the tenderness. The tooth is already crowned. What can be done? Thanks