California RDA Written Practice Exam 2025 – Full Prep Guide

Question: 1 / 400

Stains that cannot be removed from the surfaces of the teeth are

Extrinsic

Temporary

Intrinsic

Stains that cannot be removed from the surfaces of the teeth are known as intrinsic stains. This means that the discoloration is coming from within the tooth, rather than being caused by external factors such as food or drink. Options A, B, and D are incorrect because they suggest that the stains are caused by something external and can be removed. However, intrinsic stains are typically more difficult to remove and may require professional intervention.

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Superficial

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