This book aims to provide readers with the latest updates and an informative overview of the most successful diagnostic aids for periodontal diseases. This book is divided into three sections. Section 1 discusses the periodontal disease pathogenesis and how the disease develops and the contributing factors in disease development. Section 2 includes three chapters that focus mainly on the most common and recent biomarkers that aid in diagnosis of periodontal diseases. Section 3 includes one chapter and discusses a non-surgical treatment modality that could provide definite improvement in the mild to moderate conditions in periodontal diseases.