Venus White Max Comfort Gel 4 1.2 mL Syringes 4 Tips Three or four 15-minute in-office treatments with 38% hydrogen peroxide gel. Syringe-to-syringe mixing chemically activates the product, ensures a thorough mix and provides maximum freshness. Contains potassium nitrate which helps decrease sensitivity associated with bleaching. For best results, follow in-office treatment with Venus White Pro, custom take-home whitening, or Venus White Ultra, pre-filled, disposable whitening trays. Venus Comfort Gel is available separately and contains potassium nitrate and fluoride.