Feel that i brush well ,because i can even brush after every meal walk with tooth brush and still my mouth smells ,what might be the problem?

See an endodontist , as gum infections are beneath the exposed tooth margins and are not removed by brushing. Add flossing or a major brand "water pick" after every meal after the endodontist treats the gum disease.

Bad breath can be caused by many different factors, including sinus infections, periodontal problems, smoking, cavities, acid reflux, and your diet. Address all of these possibilities with your dentist and physician, and I'm confident that your problem will at least be minimized, and hopefully eradicated.