Stains formed outside the tooth structure and are removable by a prophy.

The correct term is - extrinsic stain.

Explanation:

Extrinsic stains are normally present on the surface of a tooth and occur due to taking pigmented beverages such as coffee, tea, carbonated drinks, caramel coloring, and foods. Smoking cigarettes is also one of the reasons that can cause an extrinsic stain.

This can be removed by dentists or professionals like hygienists. The stain particles act on the outer surface of the teeth and pigmented them which cause stain yellowish or brownish in individuals.

Thus, the correct answer is - extrinsic stain.

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