High Strength whitening liquid - Use anywhere-fast and convenient application. - Easily brush on for a bright smile. - PH neutral. - Safe to use. Ingredients: Deionized Water, Peroxide, Glycerin, Potassium Sortbate, Ploysorbate 20, Triethanolamine, Carbomer, EDTA Instructions: 1.turn the tail of the pen ,let essence wet the pen head 2.apply to your teeth , scratch your teeth 3.use water to clean your teeth package include: 2pc whitening essence pen