While bad breath might be a symptom of some other disorder, it most likely stems from dental decay and periodontitis. It's more than just socially awkward - it's a serious threat to your oral health.
Periodontitis is a disease affecting gums and bone that support the teeth, and it is caused by inadequate brushing and flossing. In this disease, the irritated gums pull away from the teeth and form pockets between the teeth and the gums. These pockets fill with bacteria and pus which give off a foul odor.
Patients with bad breath should be referred for a complete dental evaluation. If gum disease and/or dental decay is diagnosed, it can be treated readily. The patient will no longer have an infection in his or her mouth, and will no longer have the embarrassment of bad breath.