I actually learned something from Cosmopolitan!

How to tell if you have bad breath

You can't really tell anything by blowing in your cupped hand and inhaling. Instead, lick the inside of your wrist and let it dry—the heat of this pulse point will amplify the scent. Once it dries, smell. When I did this after lunch, the odor of what could have been the inside of a toilet bowl almost sent me to the floor. I promptly spent the next half hour looking for a mint.

If finding a mint is unsuccessful, scrape your tongue with a spoon. I haven't tried that, but it says that's where all your bad breath particles thrive.

P.S. Don't forget to wash the inside of your wrist in the near future.