An enhancing composition comprising a solvent and a base compound creates an alkaline environment for activating peroxide whiteners and accelerating the formation of free radicals from the peroxide to effect the oxidation of organic molecules causing staining of the dentition. In one embodiment, potassium hydroxide is dissolved in water to form a strongly alkaline liquid. A surfactant may also be included to clean the surfaces of the user's teeth in advance of application of the whitening composition. A peroxide may be added to the enhancing composition to provide a tooth whitening. Other additives for taste, texture, viscosity, and other oral care or oral hygiene purposes may also be included in the enhancing composition. The enhancing composition may be used for advance application to the dentition before a whitening compound. In addition, a rinse may be used after the whitening composition to neutralize the alkaline environment.