Benefits of using Arctic White Teeth Whitening Kit: Teeth Whitening Kits contain Carbamide Peroxide which is used by professional dentists. Each kit comes complete with clear and concise instructions on how to use the whitening gel and mouth guards. A kit contains enough whitening gel for up to 30 applications. Once you have the kit you can purchase more whitening gel or mouth guards separately at a later date. We have kits with a Soft Duplex Tray or with a Silicone Custom Tray, and now Teeth Whitening Pen.