Mini Kit: 4 Filled-Syringes (1.2ml each) ContrastPM+ at home whitening gels are available in variety of concentration and kits to provide customized treatments for your patients. All ContrastPM+ formulas contain Potassium Nitrate, a desensitizing agent that helps deliver a more comfortable whitening experience. As a result, your patients are more likely to comply with treatments protocols and get optimal results. ContrastPM+ 10%, 15% and 20% carbamide peroxide formulas are recommended for overnight wear, (or 4-6 hours) in custom tray. ContrastPM+ 36% has recommended wear time of 15 minutes, twice-a-day and is ideal for patients who prefer not to sleep in bleaching trays or brux.