Eli5; why does saliva taste bad in the morning?

Question

Eli5; why does saliva taste bad in the morning?

In: 1

Answer 1

Your body slows down its production of saliva at night, and swallows it less frequently when sleeping. So it gives bacteria in your saliva more time to replicate while in your mouth. This is made worse when you don’t brush your teeth before bed, because you leave bacteria with a nice supply of food on and between your teeth, gums, cheeks, and tongue.

Bacteria produce things that taste bad.