California Registered Dental Assistant (RDA) Written Practice Exam

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Stains that may be removed from the surfaces of the teeth are

  1. Intrinsic

  2. Extrinsic

  3. Permanent

  4. Internal

The correct answer is: Extrinsic

Some stains on the surfaces of the teeth can be removed with regular brushing and dental cleanings. These types of stains are known as extrinsic stains. Intrinsic stains, on the other hand, can't be removed by brushing alone and usually require professional whitening treatments. Permanent stains cannot be removed from the teeth and may be caused by factors such as medications or trauma. Internal stains occur when the inner structure of the tooth becomes discolored and may also require professional treatment. Therefore, options A, C, and D are incorrect.

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