Venus White Pro 22% Refill Kit 3 1.2 mL Syringes Whiten your patients' smiles up to 8.4 shades with virtually no sensitivity*. Contains potassium nitrate which helps decrease sensitivity associated with bleaching. Mint flavored for patient comfort. May be prescribed as follow-up treatment to Venus White Max in-office whitening. To keep teeth their whitest, Refill Kits should be used for touch-up every 612 months.