How can i cure my bad breath have been suffering for years?

The source (cause) of bad breath, i.e. halitosis, needs to be identified. The culprit is often in the oral cavity (dental, gingival or tonsillar source) but it may be from the esophagus or stomach. If an ENT doctor or a dentist does not find anything wrong in oral cavity, you may need to see a gastroenterologist.

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.