The present invention relates to the field of adult stem cells of embryonic neural crest origin, in particular, multifunctional immature dental pulp stem cells (IDPSCs). The invention discloses useful compositions and methods for the prevention or treatment of a wide range of diseases that lead to or derived from bone marrow failure (BMF), Acute Radiation Syndromes, or chemical injury through the use of isolated IDPSC population with minimal in vitro manipulation.