Venus White Pro - Refill Kit, 22% Carbamide Peroxide Home Whitening Gel, Works Gently and Quickly, 22% Refill Kit containing 3 - 1.2 ml syringes. Up to 8 shades whiter teeth. Sticky, viscous consistency for convenient application. Ensures consistent results. Reduces bleaching-related sensitivity. The high-performing formulation of Venus White-Pro Whitening combines potassium nitrate and a varying percentage of carbamide peroxide to give up to 8 shades of teeth whitening. Potassium nitrate works to reduce bleaching-related sensitivity.Carbamide peroxide comes in 3 various strengths for day or night application options. Venus White-Pro Take-Home whitening gel is available in customized trays and mint flavor for gentle teeth bleaching.Each Refill Kit contains (3 x 1.2 ml Syringes).