a method for polishing tooth surface which eases removal of a bacterial film later grown on the polished surface . the method includes the steps of providing a providing a toothpaste or slurry comprising a plurality of inorganic abrasive particles smaller than 100 nm in size , the inorganic abrasive particles comprising one or more of silica , ceria , titania , zirconia , silicon nitrite , and silica carbide , wherein the inorganic abrasive particles are sufficiently hard to be abrasive ; and polishing a tooth surface with the toothpaste or slurry to attain an ultra - smooth tooth surface which can be easily cleaned .