Aids in the prevention of dental cavities. Specially formulated to whiten deeply with proven ingredients. Active dental peroxide The same enamelsafe whitening ingredient that dentist use. Fluoride to actively strengthen and restore enamel. 3 shades whiter in 1 week.* *When used with Rembrandt Whitening Toothbrush or Rembrandt Sonic Whitening Toothbrush. Individual results may vary.