The textbook prepared by the staff of the Department of Hospital Therapeutic Dentistry of the Moscow State Medical University consists of three parts representing the main sections of therapeutic dentistry: "Dental diseases," "Periodontal diseases," "Diseases of the oral mucosa." The textbook radically differs from previous editions in the form of presentation of the material, which facilitates its assimilation. It includes the results of the latest advances in therapeutic dentistry. Methods of differential diagnostics are offered in an accessible form, new approaches to the examination of patients are used.