Abstract: A powder composition soluble in water to form a mouthwash having the following ingredients in percent by weight:______________________________________ Ingredient Amount ______________________________________ Calcium peroxide 0.5-80.0 Sodium perborate 0.5-80.0 Sodium Bicarbonate 1.0-95.0 Tetrasodium pyrophosphate 0.5-50.0 Sodium lauryl sulfate 0.5-4.0 Sodium sacchrinate 0.5-1.0 Sorbisil TS-10 (hydrated silica) 1.0-10.0 Sodium benzoate 0.5-10.0 Citric acid (anhydrous) 0.5-25.0 Mint flavor 0.5-1.0 Potassium carbonate 0.5-10.0 Tea tree oil 0.5-10.0 Sodium monofluorophosphate 0.1-1.0 Thymol (5-methyl-2-isopropyl-1-phenol), .05-10.