A titanium dioxide production method, a novel titanium dioxide product produced by the inventive titanium dioxide production method, a method for producing a plastic product using the novel titanium dioxide product, and a novel plastic product formed by the inventive plastic product production method. The inventive titanium dioxide production method comprises the steps of: (a) forming a mixture comprising a titanium dioxide material in a liquid medium; (b) wet milling the titanium dioxide material in the liquid medium; (c) after step (b), reducing the pH of the mixture to a value not exceeding 4.0; (d) after step (c), adding an effective amount of a base to the mixture to cause the titanium dioxide material to flocculate; (e) removing the flocculated titanium dioxide material from the mixture; and (f) washing the titanium dioxide material. The titanium dioxide material used in step (a) is an agglomerated titanium dioxide material which has been produced by a reaction process. Other than any inorganic oxides formed in the reaction process along with the titanium dioxide material, the titanium dioxide material used in step (a) has substantially no inorganic oxides deposited thereon. Additionally, other than any redeposited inorganic oxides originally produced in the reaction process along with the titanium dioxide material, substantially no inorganic oxides are deposited on the titanium dioxide material during the course of the inventive titanium dioxide production method.