produce very little saliva while we sleep, which is why microbes can proliferate then and give you a foul mouth to wake to. It is also why brushing your teeth at bedtime is a good idea because it reduces the number of bacteria you go to sleep with. If you’ve ever wondered why no one wants to kiss you first thing in the morning, it is possibly because your exhalations may contain up to 150 different chemical compounds, not all of them as fresh and minty as we might hope. Among the common chemicals that help to create morning mouth are methyl mercaptan (which smells very like old cabbage),
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