Three or four 15-minute treatments with 38% hydrogen peroxide gel. Syringe-to-syringe mixing chemically activates the product, ensures a through mix and provides maximum freshness. Contains potassium nitrate, which helps decrease sensitivity associated with bleaching. To keep teeth white, follow with Venus White Pro custom take-home trays or Venus White Ultra pre-filled, disposable whitening trays. Includes: (4) 1.2ml Syringes (8) 20g Black Mini Tips