Multi-layer patches for teeth whitening

A dry type patch for whitening teeth having a multi-layer structure of three or more layers comprising a contact adhesive layer, a backing layer, and an active material reservoir layer comprising a peroxide and a hydrophilic glass polymer selected from the group consisting of polyvinyl pyrrolidone-vinyl acetate copolymer, polyethylene oxide, polyvinyl pyrrolidone, Polyquaterium-11, Polyquaterium-39, and combinations thereof, and is positioned between the contact adhesive layer and the backing layer;

• wherein the contact adhesive layer is substantially free of peroxide and comprises a hydrophilic glass polymer as a base polymer such that the contact adhesive layer provides substantial adhesive attachment to the teeth when hydrated by water and placed in contact with the teeth and has insubstantial adhesiveness before hydration and attachment to the teeth,
• and the active material reservoir layer releases peroxide contained therein subsequent to the hydration and attachment of the contact adhesive layer to the teeth.