Night guard bleaching refers to:

Bleaching techniques  For vital teeth  – Home bleaching technique/night guard vital bleaching. – In-office bleaching: i. Thermocatalytic  ii. Nonthermocatalytic  iii. Microabrasion.  For nonvital teeth  – Thermocatalytic in-office bleaching  – Walking bleach/intracoronal bleaching  – Inside/outside bleaching  – Closed chamber bleaching/extracoronal bleaching  Laser-assisted bleaching.