- Great way to try Opalescence - 3 set of trays These are my favorite; they don’t hurt your teeth and are easy to use. Usually sold for $125-175 per kit(10 trays). - Bought directly from a dental office I worked in (they retired) At-home whitening kit by Opalescence. - 15% H202 - place in the mouth, suction, and remove the green tray leaving behind the whitening shell Directions: Remove the tray from the packaging. Position the upper tray on the teeth. Bite firmly, then suck on the tray for 2 seconds. Remove the colored outer tray, leaving the white inner tray on the teeth. Repeat the process for the lower tray. Recommended starting time 15-20 mins. New trays can be used daily until desired shade is reached. -I currently have other listings with 1 set, 2 sets, 3 sets, and a 10 box set.