Oral-B Centrays are fluoride applicator trays designed with a contoured fit. ¢ Stable, non-flimsy foam design keeps fluoride in the tray and moisture out ¢ Deep distal dam and high walls improve patient comfort and inhibit overflow ¢ Anatomical contours force fluoride into contact with all tooth surfaces ¢ Closed cell foam precludes fluoride absorption into the tray ¢ Rounded arch and smooth ridge provide natural fit and comfort ¢ Hide-a-hinge folds out of the way to help prevent gag reflex