 Money back guarantee. I've never heard anybody using it. Free shipping if you order three packs or more. You're going to want to order more. There's no question in my mind. And I've known the folks behind Zellmans for over 30 years. I bought into the company. I mean, that's how much I believe in Zellmans. Go to Zellmans.com, Z-E-L-M-I-N-S.com. This little tiny breath freshener, not just a breath mint.