During the last ten years, i have experimented with many different whitening systems from Zoom to Deep Bleaching, trying to find the one best suited for my patients. The one that seems to deliver the best results with the least amount of sensitivity, is the Sapphire Professional Whitening System. We use the light along with the bleaching gel which brings the teeth up an additiional 2-5 shades whiter and faster. The bleach is thick and stays stable in the trays and does not drip over the gums. There seems to be less complaints regarding sensitivitiy and the light does not emit harmful UV Rays or heat as the other lights do...it is not cheap but it works!