These are products for professionals and are now available for you. The first product in this series is ONA PRO Gel. As Ona constantly strives to improve our products, they have developed a formulation that takes control to a new level. ONA PRO Gel is as close to odorless. Although it has a slight scent when sniffed in the container, the final result when working on powerful, odors is simply a clean, fresh smell – period.