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The culprit behind bad breath in the morning is bacteria, tiny little critters too small for you to see that live naturally in and on all sorts of places -- including your mouth! The bacteria in your mouth get stinky at night because they have more of a chance to reproduce and multiply themselves, which lets off a yucky smell.

Even though you have bacteria in your mouth all day, you're constantly eating, drinking, producing saliva, and swallowing, so the bacteria don't have a chance to get out of control. At night, however, your body produces less saliva, you swallow less often, and you don't have food or drink to wash them down. - This gives the natural bacteria in your mouth the opportunities they didn't have all day, and sometimes leaves you with icky morning breath! (At least, until you brush your teeth!)

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11y ago
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Q: Why does your breath smell bad in the morning?
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