The present invention relates to a tooth bleaching material containing peroxyglutaric acid and/or peroxypolyacrylic acid as a bleaching ingredient, as well as a method of bleaching teeth which include the step of applying the tooth bleaching material in the form of a dilute solution or without dilution onto surfaces of discolored teeth. In accordance with the present invention, there are provided a tooth bleaching material for bleaching and removing colored sediments (colored or discolored deposits) on teeth which do not essentially require irradiation with light, and is readily used with a high safety and further suitable as a domestic bleaching material, as well as a tooth bleaching method using the above tooth bleaching material.