First, clean and dry your teeth, rotate the top of the teeth whitening pen until a small amount of teeth whitening gel flows from the gel chamber onto the brush. Second, use the brush to apply a thin layer of gel to the teeth. Finally, relax your lips after applying, the gel will dissolve on its own after 15 minutes and avoid eating or drinking for 30 minutes after applying. Our teeth whitening kit has long, soft bristles that penetrate each tooth with precision. It can can rapidly remove years of stains accumulated from consuming coffee, tea, wine, smoking, soda and more. Effectively remove stubborn stains accumulated over the years, and ensure that every visible part of your smile is white and clean. With its sleek, pen-like design, the teeth whitening kit is compact and easy to carry, allowing you to whiten your teeth anytime, anywhere. During the use of our teeth whitening pen, please use twice a day, within a week to see the obvious whitening effect.