This fact is from Tooth Discoloration & Bleaching in Conservative & Endodontics. It is a commonly tested concept in NEET MDS examinations. Understanding this fact is crucial for answering MCQs correctly.
Tetracycline = most common intrinsic staining
In-office bleaching = 35 percent hydrogen peroxide
Home bleaching = 10 percent carbamide peroxide
Nightguard vital bleaching = Haywood Van Heymann
Microabrasion = superficial enamel stains 18 percent HCl
Internal bleaching for endodontically treated teeth.