Other Information: Store at 20 degrees-25 degrees C (68 degrees-77 degrees F). Do not use if inner foil is torn, cut or missing. 25x more stain removed in 1 week (When used with Rembrandt Whitening Toothbrush or Rembrandt Sonic Whitening Toothbrush. Individual results may vary). Strengthens & restores enamel. Specially formulated to whiten deeply with proven ingredients. Micropolishers: A unique blend effectively whitens by removing tough stains. Fluoride: To actively strengthen and restore enamel. Care for the smile you love. www.rembrandt.com. Learn more at www.rembrandt.com. Questions or comments? Email consumercare(at)rembrandt.com, or call 800-548-3663.