No matter how much you brush your teeth, floss and use mouthwash, those years-old coffee stains just won’t fade away. It can be frustrating to see those stains tainting your pearly whites when you work so hard on your dental hygiene. Your options for whitening your teeth aren’t limited to extremely pricey dentist trips or intimidating at-home whitening kits that seem like they should be used by a professional. You can whiten your teeth in the comfort of your own bathroom or while you’re on-the-—whether you’re traveling or just at work. Teeth whitening pens are about to become your new BFF.

The best teeth whitening pens are able to erase stains that have been sitting on your chompers for 15 years. Yes, 15 years worth of coffee, soda, wine and tea stains can vanish. Wouldn’t that be awesome? Plus, they’re small enough to put in your favorite clutch.

These pens usually have gel in them, which you can either apply right before you go to bed or anytime. The gel sits on your teeth and does the hard work for you. Depending on which kit you select, they might suggest wiping the gel off your teeth after a certain amount of time or abstaining from eating or drinking after using.