The kit includes: Upper and Lower Trays that you custom fit to your mouth One 5-ml syringe of whitening gel (6 treatments) Two vitamin E sticks One LED light for quick results (used with trays and pen) A maintenance pen for whitening on the go (14 Treatments) 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, Triethanolamine, Potassium Nitrate Strawberry Bubble gum flavor or peppermint oil