Does bad breath come from other sources than the mouth?
Bad breath also may occur in people who have a medical infection, diabetes, kidney failure or a liver malfunction. Xerostomia (dry mouth) and tobacco also contribute to this problem. Cancer patients who undergo radiation therapy may experience dry mouth. Even stress, dieting, snoring, age and hormonal changes can have an effect on your breath. An odor that comes from the back of your tongue may indicate postnasal drip. This is where mucus secretion, which comes from the nose and moves down your throat, gets stuck on the tongue and causes an odor.
