A dual component tooth whitening composition is disclosed, which composition contains a peroxide whitening and a second ingredient incompatible with the peroxide compound, the second ingredient and the peroxide compound each being incorporated in separate dentifrice components which are physically separated until dispensed for use, the components retaining their original physical state when in contact, the first component being a composition containing a peroxide whitening compound in a vehicle thickened with a combination of a particulated water insoluble inorganic compound and an organic thickener other than an alkylene oxide polymer, and the second component containing the ingredient incompatible with the peroxide.