Wit HP Maxx 35% Hydrogen Peroxide In-Office Syringe-to-Syringe Whitening Kit: 1 x 1.2g whitening gel syringe, 1 x thickener gel syringe for mixing, 1 x syringe coupling device, 1 x 1g top dam syringe, and 3 applicator tips. The kit lasts for 2 whitening sessions on 3 patients. Contains calcium and has Alcaline pH during the entire application. Does not interfere with the microhardness of enamel. Both syringes are attached, providing easy mixing and application directly to tooth surface.