NuYu Teeth Whitening's range of dental gels whitens teeth in spas or the comfort of one's home. Both their take-home and in-office solutions use silicone mouth trays, which comfortably hold whitening gel snugly against teeth as they coax out stains. Their take-home whitening kits come in three varieties: a standard set with peroxide gel, an extra-strength kit designed specifically for tobacco stains, and an organic pack that preempts peroxide with an eco-friendly formula that leaves teeth so dazzling, global-warming rays are reflected right back into space.