Bad breath is breath that has an unpleasant odor. It's also known as halitosis. This odor can occur from time to time, or it can be long lasting, depending on the cause. Bad Breath is usually caused by the breakdown of proteins by bacteria somewhere in the mouth. Bad breath is not contagious, meaning you cannot catch it from someone else. Chronic bad breath, known as Halitosis, does not come from the stomach.
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