Master-Dent® SYNERGY™ is a patented dual-component system that represents the most advanced science in tooth whitening today. With a 30-minute bleaching duration, SYNERGY™ gives superior results compared to whiteners that take up to 2 hours. The unique formulation combines 30% Carbamide Peroxide with 15% Calcium Peroxide (equivalent to a 25% Carbamide Peroxide product) to deliver rapid but safe whitening results. The unique feature of this state-of-the-art whitener is that the “synergy” of the two components not only releases free calcium to support re-mineralization and rejuvenate enamel lustre - but its water release feature also prevents the sensitivity often associated with single component whiteners.