Question: which one of the following types of stain is considered an intrinsic stain?
Answer: Examples of intrinsic stains include fluorosis, tetracycline stain, and pulpitis. Since the stain is on the outside of the tooth, it can be removed by scaling and/or polishing. But over time extrinsic stain can become intrinsic. Examples of extrinsic stains include food (e.g., coffee), tobacco, and plaque.