Breath odor Definition: Halitosis, breath odour, or most commonly bad breath are terms used to describe noticeably unpleasant odours exhaled in breathing. Though specific odours can be caused by sometimes serious medical conditions, bad breath is typically innocuous in itself, and only causes problems in interpersonal relations (one's own breath odour is usually undetectable due to the process of habituation). Whereas odours indicating underlying pathology can stem in the stomach, lungs, or bloodstream, most bad breath arises in the mouth and upper throat.
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