How to tell if you have bad breath

I found this to be an interesting trick:

The first thing to do is determine if your breath is fresh or foul. Most people with stinky breath aren't even aware they have it, because the brain becomes acclimated to one's own personal scent. The good news is there are ways to self-diagnose. ...

Smelling your own breath in cupped hands is not the best way to check for halitosis, Katz says. Instead, lick the back of your hand, let it dry for a few seconds, and then smell the surface.

Lick, wait for hand to dry, then... UGH! OH DEAR GOD!!!