Get your smile special-occasion ready and experience whiter teeth in just 1 day* by using the Colgate Optic White Express Teeth Whitening Pen. Powered by hydrogen peroxide, this easy-to-use and fast-acting Colgate whitening pen with a precision tip applicator offers a glowing smile after just 3 applications. This teeth whitener pen contains 7 days of whitening treatments, is enamel safe and designed for no tooth sensitivity**. To use the teeth gel whitening pen, follow your regular brushing routine. Next, dry your teeth, then paint the whitening gel onto clean, dry teeth. Leave the whitening film on your teeth for 1 hour and remove by brushing your teeth with water. Repeat for a total of 3 applications on Day 1, and a total of 2 applications on Days 2-7. Get glowing and start living your life to the brightest with the Colgate Optic White Express Teeth Whitening Pen.