Bad breath cause of embarrassment, create social and psychological barriers , and even affect marriages. Bad Breath also known about halitosis. Bad breath can also be caused by dry mouth (xerostomia), which occurs when the flow of saliva decreases. Saliva is necessary to cleanse the mouth and remove particles that may cause odor. Dry mouth may be caused by various medications, salivary gland problems or continuously breathing through the mouth. Chronic bad breath, known as Halitosis, does not come from the stomach.