Colgate Optic White Overnight Teeth Whitening Pen, Gentle Teeth Stain Remover to Whiten Teeth, 3% Hydrogen Peroxide Gel - 0.08 Fl Oz 1 Count Enamel safe teeth whitening serum formula designed to minimize tooth sensitivity and removes 15 years of Stains in 1 week, making it a great addition to your teeth whitening products. The teeth whitening pen contains 3% hydrogen peroxide and is a vegan, gluten free and sugar free teeth stain remover. Includes: (1) teeth whitening pen, (1) overnight stand to store; 35 nightly treatments in 1 pen