Regenerative Endodontic procedure can be defined as biologically based procedures design to replace damaged structures, including dentin and root structures, as well as cells of the pulp-dentin complex Presently, two concepts exists in regeneration endodontics to treat non-vital infected teeth- one is the active pursuit of pulp-dentin regeneration to implant or regrow pulp (tissue engineering technology), and the other in which new living tissue is expected to form from the tissue present in the teeth itself, allowing continued root development (revascularization). This book emphazise on the regenerative endodontics.