Gates Glidden drill is used to:: (A) Remove the lingual shoulder, (B) Enlarge the canal orifice, (C) For the preparation of post space, (D) Both 1 and 2
Answer is D. The Gates-Glidden drill is used to:

Remove the lingual shoulder during access preparation of the anterior teeth
Enlarge root canal orifices.

Textbook of Endodontics Nisha GARG 3rd ED