Troy Brown Jr., age 16, of Nampa, Ida., for his question:

WHAT CAUSES HALITOSIS?

Halitosis is the more proper term of the condition commonly referred to as bad breath. Unpleasant odors of the mouth have many causes, many of which are brought on by the presence of bacteria that proliferates easily in the moist, warm, dark environment where food particles are often present.

Also, certain foods and beverages can also produce halitosis, as can hormonal changes.

Proper oral hygiene can keep mouth odors to a minimum. Brushing of the teeth thoroughly removes food particles that may breed bacteria. Also, the occasional rinsing of the mouth during the day will also ash out particles.

Diseases involving metabolic difficulties may produce halitosis. The diabetic whose body cannot utilize sugars for energy turns to fats and the by products of the fat metabolism build up in the blood and produce an acetone breath.

For the most part, bad breath is a rather normal occurrence. if it can't be attributed to foods eaten or to improper hygiene, however, a doctor should be consulted to determine whether this is the symptom of a disease.