This document discusses periodontal disease and conditions that can affect the gums and oral cavity. It covers different types of periodontal diseases categorized by age, sex, occupation, medical history, and personal habits. It also describes examinations of extra oral features like lymph nodes and intra oral features of the gums, tissues and structures of the mouth. Assessment indices like OHI-S and characteristics of the gingiva are provided. The effects of traumatic occlusion and furcation involvement are mentioned. The document concludes with treatment planning.