Our V34 Purple toning pencil contains glycerin, water and peppermint oil. It breaks down the melanin in your teeth, gradually brightening your teeth, reducing dental problems, and keeping your breath fresh. The way to use it is very simple: first clean the mouth with warm water, then open the lid, twist the other end of the pen, brush the essence on the teeth, wait for 30 minutes to clean the mouth. And white teeth.