National Dental Assisting Examining Board (NDAEB) Practice Exam

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Prepare for the National Dental Assisting Exam with comprehensive quiz questions, including multiple choice and detailed explanations. Equip yourself for success!

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Why might a dentist choose to use a varnish during a dental procedure?

To enhance the smile
To seal dentin tubules
To prevent decay
To strengthen enamel

The correct answer is: To seal dentin tubules

A dentist might choose to use a varnish during a dental procedure primarily for its ability to seal dentin tubules. Dentin tubules are microscopic channels located in the dentin layer of the tooth, which can be exposed during treatments such as cavity preparation. When these tubules are exposed, they can lead to increased sensitivity or discomfort, especially when exposed to temperature changes or certain substances. By applying a varnish, the dentist effectively covers and seals these tubules, reducing sensitivity and protecting the inner tooth structures from external irritants, bacteria, and potential decay. This sealing action also helps maintain the health of the tooth after procedures like fillings, crowns, or when dealing with sensitive teeth. In contrast, using varnish to enhance the smile, prevent decay, or strengthen enamel, while these may be goals of dental treatments, do not specifically capture the primary function of varnish in sealing dentin tubules. The main purpose of the varnish is its ability to reduce sensitivity and protect the tooth after dental work, rather than serving as a cosmetic treatment or directly strengthening the enamel.