14 Pre-filled disposable whitening trays (7 upper, 7 lower). Professionally designed enamel safe. Surprisingly soft, thin and flexible for a custom fit. Once a day. Visibly whiter teeth in as little as 3 days. The disposable trays are pre-filled with the same enamel-safe ingredient dentists use. The flexible tray is easy to apply. It molds securely around you teeth allowing the fresh-tasting gel to whiten even between teeth. Use one a day for visibly whiter teeth in just 3 days.