The third one is the charm! Keep a supply for yourself or buy the three pack to brighten the teeth of the whole family! Dr. Smiles Pop & Prime Whitening Pen gives you a brighter, whiter smile without causing sensitivity in just 30 seconds anywhere, anytime. Fast acting, convenient, easy to use with proprietary stain eraser tip. Remove surface stains, prepares your teeth for better results before and after in-office whitening. Get started now and whiten right in 30 seconds with no pain and all gain!