No amount of brushing, flossing, or mouthwashing will kill every bit of bacteria or remove every last bit of food in your mouth, so overnight, many bacteria regrow and with your mouth going unused and pretty dry all night, they can flourish. They also live in plaque and release acid if you eat something, which can destroy your enamel.
There are aways bacteria in your mouth, even after brushing, mouthwash, etc. Their excrement (poop) smells bad. When you’re awake you make plenty of spit and swallow often to keep washing away some bacteria and their poop. When you’re asleep you make very little saliva and don’t swallow, so the bacteria and their poop just piles up for hours. That smells.
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