Contents: Opalescence Treswhite Supreme 15% Mint Patient Kit - 6pk Each patient kit contains 10 upper/10 lower trays. SHELF LIFE: 12 months, 6 months if unrefrigerated. USES: Opalescence Treswhite Supreme 15% is recommended for entry-level whitening patients or as an alternative to over-the-counter whitening products. Potassium nitrate and fluoride decrease sensitivity while strengthening enamel and preventing caries. With no impressions, models, or lab time required, Opalescence Treswhite Supreme 15% is a perfect follow-up to in-office whitening. Also available in a 10% formulation with peach, mint and melon flavor options.