Take years of staining off your teeth that was left by gulps of coffee, sips of wine, and years of enjoying teeth-staining foods. The Pearl Whitening Kit also offers remineralization gels, which reduce tooth sensitivity and strengthen enamel by replenishing important minerals. The Grace & Stella Pearl Whitening Kit uses the same professional-grade whitening gel that dentists use but for a fraction of the price. Simply load the gel into the included mouth trays, insert trays snuggly against your teeth, and wait 10-20 minutes for best results. Rinse gel off teeth after use and do not ingest the gel. Results can be seen after just a few uses. Please read and follow the enclosed instruction guide for complete details on usage.Ingredients: 16% Hydrogen Peroxide Gel, 35% Carbamide Peroxide Gel, Glycerin, Propylene Glycol, EDTA Sodium Hydroxide, Hydroxypropylcellulose, Triethanolamine, Carbopol 940/974 PNF.