system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do we get morning breath?

Well, I say we. Where does it come from? Bacteria in the mouth?
gpt
The bacteria that grows and multiplies in your mouth while you sleep, when they are relatively undisturbed. If you woke up every so often and drank something, that would wash away much of the bacteria (into your belly) and you would have noticeably nicer-smelling breath in the morning.