Restorative & Materials · single question
Which agent is most commonly used for external (in-office) vital tooth bleaching?
Show answer and explanation
Correct answer: A. Hydrogen peroxide (or carbamide peroxide, which breaks down to hydrogen peroxide)
External bleaching uses hydrogen peroxide directly, or carbamide peroxide that decomposes into hydrogen peroxide; the peroxide oxidizes intrinsic stains.Other options: Sodium hypochlorite is an endodontic irrigant, phosphoric acid is an etchant, and calcium hydroxide is a medicament/liner.Key exam takeaway: Vital bleaching = hydrogen peroxide (or carbamide peroxide, its precursor).
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