Endodontic Surgery should be avoided in

 # Endodontic Surgery should be avoided in:

A. Short rooted teeth

B. Teeth with periodontal disease

C. Lingual surface of mandibular molars

D. All of the above

The correct answer is D. All of the above.

Because of inaccessibility and difficulty to gain access to the surgical site through dense layers of bone, endodontic surgery should be avoided on lingual surfaces of molars or external oblique ridge of mandible.