We specially formulated ZERO Teeth Whitening in our lab and are proud to offer this potent blend of botanical and baking soda that works overtime to brighten the dullest of smiles. Ultra- sensitive customers will swoon over this new innovation in teeth whitening. Restore your teeth, crowns, veneers and caps to a natural white the pain free way with ZERO Teeth Whitening. Pen Instructions:Twist and click the base of the pen until gel exudes from the brush tip. Dry your teeth, paint on the gel and whiten while you sleep.