Eli5; why does saliva taste bad in the morning?
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You don’t drink water while you sleep, so the tendency of the body in general is that you dehydrate. Some is lost to sweat, some to kidney filtration into the bladder, and a good portion gets breathed out. As the mouth dries out, and bacteria continue to do their thing, morning saliva is a bit extra smelly. If you’ve ever smelled someone’s breath after they haven’t been drinking water, it is not pleasant.
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