Ideal for on-the-go situations, travel, office or carry along. Convenient and easy to use, whitening pens contain high viscosity 35% Carbamide Peroxide whitening gel, which is dispensed by pushing the pen base. Approximately 15-20 applications to upper and lower teeth. Brush applicator allows thorough teeth coverage. No dental trays required. Ideal for use with the LED Blue Accelerator Light.