This contribution contains the 3D model(s) described and figured in the following publication: The present 3D Dataset contains the 3D models and CT-Scan slices of the lower jaws and teeth analyzed in “A new prozostrodontian cynodont (Eucynodontia, Probainognathia) from the Upper Triassic of southern Brazil”. https://doi.org/10.1080/02724634.2020.1782415