The truly unsettling thing about bad breath isn't the odor itself, but the fact that you are usually the last to notice it. Most people find it hard to accurately gauge whether their own breath is fresh.
This is because the nasal passages gradually adapt to familiar scents, and odors originating deep within the mouth are not always perceptible to the individual. Even more awkward is the fact that those around you typically will not point it out directly. They might simply lean back slightly during a conversation, hesitate when drawing near, or seem a little less at ease during intimate moments. And what you end up noticing are often nothing more than these subtle shifts.
