Opalescence 20 Whitening Review - Version 1.0 This program reviews Opalescence 20, a powerful at-home teeth bleaching gel kit. Opalescence is one of the most popular teeth whitening kits and is designed for maximum whitening with minimum tooth and gum sensitivity. - Learn about who Opalescence 20, 10, 15, and 35% is ideal for and what makes the system so popular and effective.- Find out what you need for an Opalescence treatment.- Learn why you should not get Opalescence directly from your dentist.- And find detailed Opalescence instructions and tips.