Karisma In-Office Regular Strength Single Session is a Pre-Filled Tray Whitening for a 20 Minute Session. Allows quick delivery, No Preparation Time, Minimal Chair Time. Includes Potassium Nitrate to eliminate Tooth Sensitivity. Includes: 1 Pre-Filled Dual Arch Tray 2 Vitamin E Oil Applicators 1 At Home Re-Fill Syringe (3.5 ml)