This course aims to enable students to learn principles of periodontology, periodontal tissue elements and their interaction, to know periodontal diagnosis methods and their differences. To analyze difference between inflamed and healthy gingiva clinically, and having knowledge about clinical gingival inflammation process. To understand the causes of preferring various diagnoses methods by classifying periodontal diseases in accordance with current classification criteria, and the etiological factors and possible mechanisms of the development of periodontal disease. To learn different etiological factors of different periodontal diseases, to know the instruments used in periodontal treatment, to learn clinical periodontal treatment approaches and general principles. T