Abstract: A devitalized tooth having an outer surface at which opens a longitudinally extending and empty pulp cavity into which open transverse tubules is rebuilt by a prosthesis comprising a peg engaged with spacing in the cavity and having an outer end projecting from the cavity past the outer surface of the tooth, a prosthesis body adhered to the outer end of the peg, and a generally conical flexible and porous sheath formed of high-strength filaments surrounding the peg in the cavity. A solid mass formed of a durable resin that has a very low surface tension when liquid fills the cavity around the peg and the tubules. The sheath is wholly imbedded in the cavity in the mass.