eli5: Why do your teeth feel so gross when you first wake up even though the last thing you did before sleeping was brush your teeth?

Question

I assume it has something to do with the bacteria in your mouth thriving and replicating from the warm, moist, undisturbed environment…. But you’re not eating at night to help form plaque so I don’t get it.

In: 1710

Answer 1

Because the bugs that live in your mouth, and consume the bacteria in your mouth, have been pooping for the last 8 hours.