Five years ago, I had a failed treatment. It was stopped because a root was cracked during the procedure. I then had a to help keep the in place. Lately, I noticed a foul smell coming from my gum. I wonder if it's caused by the cracked or the bridge. I have a good oral hygiene; I brush twice a day, floss once a day and I mouth wash regularly. Could it be that the fractured tooth has started to decay? What should be done to treat this?