<prompt> Night guard bleaching refers to:Laser activated bleachingDentist prescribed home applied techniqueThermobleachingPhoto bleaching  <response>: Bleaching techniques For vital teeth Home bleaching techniquenight guard vital bleaching. In-office bleaching:i. Thermocatalytic ii. Nonthermocatalytic iii. Microabrasion. For nonvital teeth Thermocatalytic in-office bleaching Walking bleachintracoronal bleaching Insideoutside bleaching Closed chamber bleachingextracoronal bleaching Laser-assisted bleaching. 