Violation

Infraosseous defects may occur at the 1. palatal surface of maxillary anterior teeth. 2. buccal and lingual surfaces of molars. 3. interproximal areas. 4. bifurcations and trifurcations

All of the above

(1) (2) (3)

(1) and (3)

(2) and (4)

(4) only

Please describe the matter of abuse