How do I tell someone they have bad breath in a polite way?

bad breath
cristina p asked:

Its one of the bosses actually. I mean I don’t want to be rude coz that could cost me my job. But it really does stink and a lot of people in the office are laughing at his back.

he’s nice to me so I want to be nice to him too. How should I do it?

Rapid Cure for Bad Breath