<prompt> The technique of home bleaching prescribed by dentistWalking bleachNight guardBothNone.  <response>: Although a 3 ether and peroxide mouthwash used for bleaching in 1893 has been reported in the literature, the dentist-prescribed, home-applied technique also referred to as nightguard vital bleaching or at-home bleaching for bleaching vital teeth outside the oice began around 1968, although it was not commonly known until the late 1980s.Walking bleach is a non vital bleaching procedure. 