Halitosis, or bad breath, is an unpleasant odor coming from your cat's mouth. Usually halitosis has oral causes, although sometimes it can be caused by other disease processes. Some of these include inflammation of the gums, tooth abscesses, mouth wounds, mouth cancers, lung disease and even severe kidney disease. Consult your veterinarian if your cat has prolonged bad breath.
For more information, please read Halitosis