Which of the following materials is the most difficult to remove from a tooth surface during tooth prophylaxis?

Question

Quizplus · Accepted Answer

Calculus, also known as tartar, is the most difficult material to remove from a tooth surface during prophylaxis. It is a hardened plaque that has built up on the teeth over time and can only be removed with special dental equipment. Acquired pellicle is a thin layer of protein that forms on the tooth surface and can be removed with regular brushing and polishing. Food debris and plaque can also be removed with prophylaxis, but calculus is much more stubborn and requires more intensive treatment.

Which of the Following Materials Is the Most Difficult to Remove