1.This professional strength whitening brush-on paint pen allows for a thin application of whitening gel. 2.The active oxygen bubbles instantly remove to remove stains. 3.It is ph neutral & easy to apply. The gel dries quickly, so it will not rub off 4.Powerful Whitening: it brings the power of professional whitening directly to you in a convenient gel pen. 5.Powerful Results: within just 1 week you will be able to whiten your teeth up to 4 shades whiter. 6.Convenience: can travel with you, so you can easily whiten on-the-go to ensure that whitening treatments are not missed. 7.Most Effective: paint on whitening is the most effective method of teeth whitening because it begins the whitening proces