Limited Time Special Offer - Now 2 for €25 instead of €39.90 Easy to use  Removes daily tea & coffee stains Contains the active ingredient Hydrogen Peroxide 2.1ml The TikTok sensation Teeth Whitening Pen is an easy-to-use pen for whitening on the go. It dispenses a small amount of gel, which contains the active whitening ingredient hydrogen peroxide, onto the teeth. Unlike other pens which use a white paint-like substance to cover stains, this formula actively dissolves stains leaving long-lasting results.