Abstract
The strongest evidence for smoking as a risk factor for periodontal disease has been established, and in order to scrutinize their relevance we analyzed real-world clinical data on periodontal tissue examination and smoking habit collected at the member clinics of the Japan Health Care Dental Association (JHCDA). The results showed that smoking status at the initial periodontal tissue examination was more strongly related to the number of remaining teeth and the number of missing teeth than smoking status at the re-evaluation, and that smoking cessation during the study period had not a significant impact on the number of remaining teeth. When the degree of periodontal disease progression was taken into account, but smoking status was significantly correlated with the number of remaining teeth and the number of missing teeth in cases of periodontal disease at moderate or severe stages, suggesting that smoking cessation may save teeth when the progression of periodontal disease was in its moderate or severe stages.
