Extrinsic (exogenous) stains can be removed by rubber cup polishing.Intrinsic (endogenous) stains cannot be removed by rubber cup polishing but can be removed by air polishing.
A) Both statements are true.
B) Both statements are false.
C) The first statement is true;the second statement is false.
D) The first statement is false;the second statement is true.
Correct Answer:
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