Abstract: The present invention relates to a method of forming shape-retentive aggregates of gel particles in which the aggregates are held together by non-covalent bond physical forces such as, without limitation, hydrophobic-hydrophilic interactions and hydrogen bonds. The method comprises introducing a suspension of gel particles in a polar liquid at a selected concentration, wherein the gel particles have an absolute zeta potential, into a medium in which the absolute zeta potential of the gel particles is decreased, resulting in the gel particles coalescing into the claimed shape-retentive aggregate. This invention also relates to uses of the method of formation of the shape-retentive aggregates of gel particles.

Abstract: A thin, flexible, bilayer or multi-layer film which when applied to a moist surface of a body tissue adheres and delivers an active agent, pharmaceutical compound, nutraceutical, flavor or other substance to the underlying surface and/or body cavity and erodes at a predetermined rate. In one application, the amount of time that the active agent remains in contact with the teeth surfaces is controlled by the composition and thickness of the backing layer of the composite film. This erosion or residence time can be regulated from one half hour to several hours, depending upon the desired therapeutic or cosmetic application.

Abstract: The present invention relates to a method of forming shape-retentive aggregates of gel particles in which the aggregates are held together by non-covalent bond physical forces such as, without limitation, hydrophobic-hydrophilic interactions and hydrogen bonds. The method comprises introducing a suspension of gel particles in a polar liquid at a selected concentration, wherein the gel particles have an absolute zeta potential, into a medium in which the absolute zeta potential of the gel particles is decreased, resulting in the gel particles coalescing into the claimed shape-retentive aggregate. This invention also relates to uses of the method of formation of the shape-retentive aggregates of gel particles.