Get professional results at home! This 2 pen pack teeth whitening gel will have your teeth whiter and brighter after just one use. This duo pen pack will last you all month! Take them anywhere! *Up to 10 shades whiter *30 applications in each pen *FDA registered *Convenient, Easy to use *Refreshing peppermint flavor DIRECTIONS: 1) Brush teeth and floss. 2) Twist pen to dispense gel. 3) Smile wide to keep lips away from teeth. 4) Dry teeth, the drier teeth are, the better results. 5) Apply a thin layer of gel to teeth (keep off gums) 6) Rinse after 30 minutes. The Sciences behind Smile Sciences, How does it work? A carbamide peroxide and hydrogen peroxide blend penetrates your enamel to get to discolored molecules. Oxygen molecules from the whitening agents react with the discolored molecules in your teeth, breaking the bonds that hold them together. This results in a whiter, brighter smile. INGREDIENTS: Propylene Glycol, Kosher Glycerine, Carbamide Peroxide, Carbomer,, Triethanol