Pola Day for Aligners, 35% Carbamide Peroxide, Contains: 1.3g Syringes (For resale to Healthcare Professionals only. Products cannot be sold direct to the public, to retail store (7700553)Pola whitening gel for aligners is perfectly formulated for use with orthodontic aligner trays. Available in convenient 4 syringe kits for take home, in office and day or night wear. The high water content gel contains potassium nitrate and fluoride to reduce sensitivity. The high viscosity, neutral pH gel ensures the greatest patient comfort in a whitening kit.