Our V34 Purple Tint Dental Pencil contains glycerin, water, peppermint oil. It breaks down the melanin of your teeth, gradually brightens your teeth, reduces dental problems, and keeps your breath fresh. The way to use it is very simple: first clean your mouth with warm water, then open the lid, twist the other end of the pen, brush the serum on your teeth, wait 30 minutes and then clean your mouth. And it can whiten teeth.