ONE TIME OFFER: Whiten Teeth, Prevent Stains, And Strengthen Your Teeth Between Treatments With The Starbright Pen: Do you wish you could prevent stains before they appear on your teeth? Now you can with the Starbright Pen. Not only can you whiten your teeth at work, in the restaurant, or anywhere, you can prevent stains from happening in the first place with the built-in enamel booster gel. Use one side to whiten and the other side to prevent stains and strengthen your teeth. Finally, a teeth whitening pen that is actually good for your teeth! Check the box above to add stain prevention to your order.