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years worth of stubborn tooth stains from food,coffee,wine,cigarette,cola,soda,ectCarbamide peroxide/ Carbopol/ Propanediol/ Glycerin/ PH Regulators/ Sta bilizer/ Menthol1. Please rinse tray before using and dry the teeth. 2. Apply whitening gel into tray. 3. Connected by iPhone/ Android/ Mrio-USB/ USB port, put mouthpiece tray into your mouth and bite tightly when the light is on. You can try this a few times until you get the perfect fit. 4. Rinse your mouth after 15 minutes. 5. Clean the tray and put it on a cool and dry place for next time.FDA&MSDS approves





