I had a crown put on 3 months ago. I have had pain under the crOwn since it was done. I did have a root canal before the crown and have had it checked, they said everything is dead.I even went back to the dentist who did the crown and told him something is irritating under the crown and it smells. I floss and use a water pick. The floss will go under the crown. After a month I went back and the dentist said everything was fine. The tooth is still sore and still smells, what should I do?