About ten years ago I had a root canal done. Ever since then I noticed my breath began began to get worse. Now it has come to the point that my breath can be smelled a mile away. Even when my mouth is closed it can be smelled. I brush fequently, use mouthwash and floss and the smell never change not even for a minute. When I eat the smell is even worse.I've gone to the dentist and they ruled out gum disease. I also went to the doctor and they can't find anything wrong with me. Please help, I've been going through this for so long and I am extremely frustrated. Can this condition just be halitosis from the mouth and nothing more?