Classification ●L. Gingival diseases o A Dental plaque-induced gingival diseases o B. Non-plaque-induced gingival lesions Department of Oral Pathology, Shandong University http://course.sdu.edu.cn/oralhistopath.htmlDepartment of Oral Pathology, Shandong University http://course.sdu.edu.cn/oralhistopath.html 16  I. Gingival Diseases  A. Dental plaque-induced gingival diseases  B. Non-plaque-induced gingival lesions Classification