Which of the following represents an endogenous stain?

Question

Quizplus · Accepted Answer

Staining from an excessive amount of fluoride during development of the tooth is an example of an endogenous stain.
A stain from blueberries or coffee is an example of an exogenous extrinsic stain,meaning the stain originates from outside the tooth,is caused by an environmental agent,and can be removed.
A stain from dental amalgam that has been incorporated into tooth structure is an example of an exogenous intrinsic stain,meaning the stain originates from outside the tooth,is caused by an environmental agent,but cannot be removed because the stain has become incorporated into the structure of the tooth.

Which of the Following Represents an Endogenous Stain