If I brush my teeth in the morning and fast for 7 hours, my breath still smells kinda ok. But if I brush my teeth before bed then wake after 7 hours, it’s less pleasant. What’s happening to be different?

Question

If I brush my teeth in the morning and fast for 7 hours, my breath still smells kinda ok. But if I brush my teeth before bed then wake after 7 hours, it’s less pleasant. What’s happening to be different?

In: 6

Answer 1

Closed mouth.

Bacteria multiply as you’re not swallowing.

The bacteria are also working anaerobicically (absense of oxygen) which produces more smelly waste.