A pulverizing attachment for an excavator, comprising: a plurality of tooth members , each tooth member having a body portion , the body portion having opposing forward and rearward abutment surfaces defining a body length, each tooth member having a longitudinal slot extending between the forward and rearward abutment surfaces , the longitudinal slot having a pre-defined cross-sectional shape, a relief slot disposed proximate each abutment surface , the relief slot extending substantially transverse to the longitudinal slot through a portion of the body portion thereby producing a flexible end portion capable of deflection upon application of a longitudinal compression force; an upper jaw and a lower jaw , each jaw having a plurality of spaced tooth rails onto which one of the plurality of tooth members is slidably received, each tooth rail having a cross- sectional shape complimentary to the pre-defined cross-sectional shape of the longitudinal slot of the plurality of tooth members , each tooth rail having a length defined by front end and a rearward stop surface , the rearward stop surface abutting the rearward abutment surface of the tooth member slidably received thereon; upper and lower jaw cover plates , each cover plate having a plurality of spaced tooth retaining ribs corresponding to each of the plurality of spaced tooth rails of the upper and lower jaws , each retaining rib abutting the forward abutment surface of each of the tooth members slidably received onto each of the tooth rails , the retaining ribs applying a longitudinal compression force deflecting the flexible end portions of each of the tooth members received on each of the tooth rails ; whereby the longitudinal compression force in cooperation with the complimentary shape of the longitudinal slot and the tooth rail , rigidly restrain each tooth member with respect to the tooth rail . a plurality of tooth members , each tooth member having a body portion , the body portion having opposing forward and rearward abutment surfaces defining a body length, each tooth member having a longitudinal slot extending between the forward and rearward abutment surfaces , the longitudinal slot having a pre-defined cross-sectional shape, a relief slot disposed proximate each abutment surface , the relief slot extending substantially transverse to the longitudinal slot through a portion of the body portion thereby producing a flexible end portion capable of deflection upon application of a longitudinal compression force; an upper jaw and a lower jaw , each jaw having a plurality of spaced tooth rails onto which one of the plurality of tooth members is slidably received, each tooth rail having a cross- sectional shape complimentary to the pre-defined cross-sectional shape of the longitudinal slot of the plurality of tooth members , each tooth rail having a length defined by front end and a rearward stop surface , the rearward stop surface abutting the rearward abutment surface of the tooth member slidably received thereon; upper and lower jaw cover plates , each cover plate having a plurality of spaced tooth retaining ribs corresponding to each of the plurality of spaced tooth rails of the upper and lower jaws , each retaining rib abutting the forward abutment surface of each of the tooth members slidably received onto each of the tooth rails , the retaining ribs applying a longitudinal compression force deflecting the flexible end portions of each of the tooth members received on each of the tooth rails ; whereby the longitudinal compression force in cooperation with the complimentary shape of the longitudinal slot and the tooth rail , rigidly restrain each tooth member with respect to the tooth rail . <EOS>