This book "Oral Microflora and Dental Diseases" presents the basic and current understanding of the oral microflora and its clinical significance in the development of dental diseases. The content of the book includes information about the formation of normal oral flora. The nature of inflammatory periodontal diseases is discussed. The methods of molecular biological diagnosis of pathogenic oral microflora are outlined. The role of Helicobacter pylori in the development of pathological inflammatory processes in the bone tissue of the jaws is revealed. Etiological factors leading to partial secondary adentia and their influence on the rate of postoperative inflammatory complications during direct dental implantation are described. Diagnostic methods for Helicobacter pylori in peri-implantitis. The book is intended for dentists, maxillofacial surgeons, microbiologists, laboratory diagnosticians. Implantologists who provide medical care to patients who need dental implants and use orthopedic constructions supported by dental implants. Students of medical universities and colleges.