In oral epidemiology, the data of oral epidemiology in China were updated and the methods of oral clinical trials were added. In the prescription of caries prevention, the standards and methods of clinical diagnosis of early caries are added; In the chapter of fluorine and dental health, the concept of fluorine as a trace element needed by human beings and the specific efficacy and safety of fluorine in caries prevention are more accurately positioned, which increases the risk factors of periodontal disease in the pathogenic factors and prevention; Chapter 7 extends brushing to self-oral health care, adding mouthwash, interdental cleaning, chewing and gum massage. Chapter 8, Nutrition, Diet and Oral Health, adds the process of nutrition and calcification, the stage of tooth development, the influence of taste and smell on nutrition intake, the value of teeth in nutrition intake, sugar substitutes and several dietary guidance pyramids; Chapter 11, Oral Health Education and Oral Health Promotion, expands the content, strategy, planning, implementation and evaluation of oral health promotion; Chapter 12 "Community Oral Health Care" not only introduces the experience of industrialized countries, but also focuses on the needs and practical experience of developing countries, which is included in the textbook; In chapter 13, the concept of self-management and the concept and content of project and project management are added to the oral hygiene project management. Of course, some chapters have not changed much.