The Best Way to Remove the Black Line Stain on the Lingual

Multiple Choice

The best way to remove the black line stain on the lingual aspects of both arches is to:

A) Polish with coarse grit pumice using a motor-driven handpiece
B) Use a slim-diameter ultrasonic tip with a straight working end to remove the stain
C) Use a Nabers diamond-coated file (This instrument has a similar design as a Nabers furcation probe and is diamond coated.)
D) Use a universal curet to remove the stain