Recent studies focused on the subgingival microbiome and the host immune response suggest there is an untapped potential for non-invasive oral sampling to assist clinicians in the chairside diagnosis and, potentially, prognosis. Here, this book portraits various diagnostic aids, their importance in clinical practice, as well as emphasis on chairside diagnostic test kits for diagnosing periodontal diseases, which simplifies diagnosis, treatment plan thus helps in improving the prognosis. The contents of the book includeSECTION I: INTRODUCTION AND HISTORYSECTION II: MICROBIOLOGICAL DIAGNOSTIC AIDSSECTION III: RADIOGRAPHIC DIAGNOSTIC AIDSSECTION IV: DIAGNOSIS BY IMMUNODIAGNOSTIC TECHNIQUESSECTION V: CHAIRSIDE DIAGNOSTIC AIDSSECTION VI: DIAGNOSTIC AIDS IN IMPLANT DENTISTRY