22% Maintenance Kit - Take Home Teeth Whitening Gel. Maintenance Kit Contains: 3 - 3 ml syringes of 22% carbamide peroxide gel with dispensing tips and patient instructions, microfiber bag and the Nu Radiance reusable water bottle. Each 3 ml syringe is 5-6 complete treatments. Highly effective on persistent stains. Recommended for treating Tetracycline stains. High viscosity pleasant tasting gel.