Our Teeth whitening pens contain purified water, baking soda, xylitol and more. It freshens breath, cleans tartar, brightens teeth and removes stains. Its use method is very simple: after gargling, rotate the pen bottom, squeeze out a small amount of liquid to the tip of the pen. Apply a thin layer of liquid to the tooth and let it dry for a minute or two. After 10 to 20 minutes of whitening, rinse your mouth with water. Remove cigarette, tea, wine and coffee stains. Our teeth whitening serum is dedicated to restoring your best smile.