Whiten teeth while you sleep. In as little as a week (two weeks of treatment is recommended for best results), the teeth whitening gel pen formula whitens your teeth up to two shades. The whitening pen pack includes one teeth whitener pen and one overnight stand for easy storage next to the sink or countertop. Gentle Whitening: Enamel safe teeth whitening formula has been designed for no sensitive teeth during and after the whitening process.Easy to Use: Click the back of the pen to dispense the unique formula to clean, dry teeth. The teeth stain remover formula dries quickly and whitens your teeth overnight. To remove, simply brush your teeth when you wake up to white teeth.