Bad breath  Bad breath, sometimes called halitosis, is an
unpleasant odor of the breath.It is likely to be experienced by
most adults at least occasionally. Bad breath, either real or
imagined, can have a significant impact on a person's social and
professional life.  Bad breath can be caused by a number of
problems. Oral diseases, fermentationof food particles in the
mouth, sinus infections, and unclean dentures can all contribute
to mouth odor. Many non-oral diseases, such as lung
infections,kidney failure, or severe liver disease, can also
cause bad breath, althoughthis is rare.  Many people think that
bad breath originates in the stomach or intestines. This rarely
happens. The esophagus is usually closed, and, although a belch
maycarry odor up from the stomach, the chance of bad breath
being caused from air continually escaping from the stomach is
remote. Cigarette smoke can causebad breath, not only in the
cigarette smoker, but also in one who is constantly exposed to
second-hand smoke.  The easiest way