In an in-office treatment, what is placed on the facial surface of teeth during whitening?

Prepare for the Oregon Expanded Function Dental Assistant Exam. Utilize flashcards and multiple choice questions with hints and explanations. Ensure you're ready for your certification!

In in-office teeth whitening treatments, a dental dam is applied on the facial surface of the teeth to protect the surrounding soft tissues, such as gums and lips, from the whitening agents used during the procedure. The dental dam creates a barrier that helps ensure the whitening solution remains in contact with the teeth and minimizes the risk of irritation or chemical burns to the non-target areas.

The other options do not serve this protective function during whitening. Varnish is typically used for fluoride treatments and cavity prevention but is not relevant in this context. Acid etch is a technique used primarily in bonding applications for restorative dentistry, not whitening. A dentin sealer is used to seal the dentin when performing procedures like dental restorations or when dealing with tooth sensitivity, rather than during the whitening process. Thus, the dental dam is specifically designed for this role in in-office whitening treatments.

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