The bleaching material used for night guard vital tooth bleaching is
**Core Concept**
The question is testing the student's knowledge of the bleaching materials used in night guard vital tooth bleaching, which is a procedure to whiten teeth in a controlled manner. This involves the use of a tray and a bleaching agent that is activated by a chemical reaction.
**Why the Correct Answer is Right**
Night guard vital tooth bleaching involves the use of a carbamide peroxide gel that is applied to the tray and worn over the teeth at night. The carbamide peroxide breaks down into hydrogen peroxide, which is the active bleaching agent. The hydrogen peroxide penetrates the tooth enamel and breaks down the chromogens, which are the pigments that cause tooth discoloration. This results in a whiter and brighter smile.
**Why Each Wrong Option is Incorrect**
**Option A:** This is an incorrect option because carbamide peroxide is the primary active ingredient in night guard vital tooth bleaching, not sodium perborate.
**Option B:** This is an incorrect option because sodium perborate is used in non-vital bleaching, not night guard vital tooth bleaching.
**Option C:** This is an incorrect option because sodium bicarbonate is a mild abrasive used in some toothpastes, but it is not a bleaching agent.
**Clinical Pearl / High-Yield Fact**
It's essential to note that night guard vital tooth bleaching is a non-invasive procedure, but it requires careful selection of the patient and proper instruction on how to wear the tray. The patient should also be aware of the potential side effects, such as tooth sensitivity.
**Correct Answer:** C. Sodium bicarbonate