The Colgate Optic White combo is a blessing to everyone with a busy schedule & especially to those who are struggling to sneak in some self care minutes wherever they can. With just one additional step added to your usual night time routine you can have a brighter & whiter smile. After brushing my teeth after an exhausting day all I have to do is apply the optic white pen to my teeth and let it do its job while I recharge during the night. I love a lazy girl solution to all my problems.