Karisma In-Office Extra Strength Single Session is a Pre-Filled Tray which allows a quick delivery minimizing Preparation Time, Chair Time. Includes Potassium Nitrate to eliminate Tooth Sensitivity. Combine the Karisma 20 Minute In-Office Whitening Session with a Cleaning Visit. Quick, Convenient, Virtually No Sensitivity. The Karisma In Office Pre-filled Tray Whitening requires Minimal Set Up Time, Minimal Chair Time, and has Virtually No sensitivity to the teeth. Includes a Liquid Dam Gum Barrier to protect the tissue. The Tray can be Re Used At Home with the Re-Fill At Home Syringe included in each kit. Includes: 1 Pre-Filled Dual Arch Tray 1 Liquid Dam 1 Cheek Retractor 2 Vitamin E Oil Applicators 1 At Home Re-Fill Syringe (3.5 ml)