Which of these is a classifications of exogenous stains?

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Multiple Choice

Which of these is a classifications of exogenous stains?

Exogenous stains come from outside the tooth, and a common way to describe them is by how they interact with the tooth surface. Direct exogenous stains refer to pigments that attach directly to the enamel surface from external sources (like coffee, tea, tobacco, or certain chromogenic organisms) and are typically removable with cleaning or scaling. The other pairings mix terms that describe location (extrinsic vs intrinsic) or internal origin (endogenous), which don’t specifically classify exogenous stains. So naming a direct exogenous stain clearly identifies a type of exogenous stain.

Exogenous stains come from outside the tooth, and a common way to describe them is by how they interact with the tooth surface. Direct exogenous stains refer to pigments that attach directly to the enamel surface from external sources (like coffee, tea, tobacco, or certain chromogenic organisms) and are typically removable with cleaning or scaling. The other pairings mix terms that describe location (extrinsic vs intrinsic) or internal origin (endogenous), which don’t specifically classify exogenous stains. So naming a direct exogenous stain clearly identifies a type of exogenous stain.

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