An intracoronal bristle brush for preparing a tooth cavum comprising a plurality of bristles and a dental bit having a first end being a shank adapted to be received by a dentist's handpiece and a second end for receiving the plurality of bristles. The plurality of bristles emanate outwardly in a uniform manner from an axial hole within the second end. The diameter of the intracoronal bristle brush is substantially uniform along its entire length such that the bristles of the brush may penetrate into an interior surface of a tooth cavum.