Opalescence Oh! unit-dose disposable bulbs are filled with Ultradent’s sticky, viscous Opalescence whitening gel. Opalescence Oh! contains the time-tested Opalescence gel and patented potassium nitrate and fluoride formula for increased enamel strength, minimized sensitivity, reduced risk of caries, and a brilliantly striking smile. Opalescence Oh! is available in 10%, 15%, 20%, and 35% carbamide peroxide options in mint, melon, and regular flavors.