3. Predilection sites ● Pit and fissure o Interproximal(contact)area o Gingival third of the labial an buccal surfaces ● Exposed oot surface Department Of Oral Pathology, Shandong university 2htp://1.51.214.13Department Of Oral Pathology, Shandong University 2 http://1.51.214.13  Pit and fissure  Interproximal (contact) area  Gingival third of the labial and buccal surfaces  Exposed root surface