It has been reported that the prevalence of periodontal disease in China is still higher than that of dental caries. China’s oral health survey of 140,712 people aged 5-74 years in 11 provinces and cities showed that the prevalence of untreated caries at the age of 12 was 42.6%, and the prevalence of periodontal disease was 69.0%; the prevalence of untreated caries between the ages of 35 and 44 was 47.7%, and the prevalence of periodontal disease was 97.2%; and the prevalence of untreated caries between the ages of 67 and 74 was 59.1%, and the prevalence of periodontal disease amounted to 99.4%. In the 65-74 years of age of urban and rural male and female residents, investigated 23452 people, including the whole mouth without a tooth number of 2465 people, accounting for 10.51% of the number of people examined; the average number of permanent teeth containing only 20.27; the number of people containing 20 permanent teeth only accounted for 57.68% of the total number of people examined, containing 22 only accounted for 49.94%, containing 28 only accounted for 11.57%. According to the above data, it is estimated that the number of people over 80 years old in China who have 20 permanent teeth may only be about 35%. The culprit of missing teeth is periodontal disease. Gingivitis and periodontitis have a common symptom, that is, when brushing and eating, the tooth bed is easy to bleed, most of the time there will be red and swollen gums. However, more than 40% of people do not know that bleeding gums is a disease, but even let it happen, and even give up brushing. Forty percent of people have never seen an oral surgeon.