"Zero Teeth Whitening means no sensitivity or chemicals ingredients and this product can be used while pregnant or nursing and is ideal for anyone who prefers the natural approach. Ultra-sensitive customers will swoon over this new innovation in teeth whitening. We specially formulated ZERO Teeth Whitening in our lab and are proud to offer this potent blend of botanicals and baking soda that works overtime to brighten the dullest of smiles. 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."