<prompt> Failure of Hertwigs epithelial sheath diaphragm to investigate the proper horizontal level leads to:Taurodontism.Dentin dysplasia.Pulp polyp.Amelogenesis imperfecta.  <response>: TAURODONTISMAlso called Bull-like teeth.Originally described by Sir Arthur Keith in 1913 to describe a condition in which the body of the tooth is enlarged at the expense of roots.Caused by the failure of Hertwigs epithelial sheath diaphragm to investigate the proper horizontal level. 