Objectives : The objective of this study was to estimate a Korean’s lifetime dental expenses depending on diabetics. Methods : We ana lyzed the Korea Health Panel Survey from 2010 to 2017. The samples of diabetics extracted from 137,588 using R version 3.0 in the data of outpatient dental care and estimation of lifetime dental expenditures for diabetics generated using Excel. Results : The results showed that an estimate of average per capita lifetime dental expenditure was about 6.5 million won for men (33 years) and about 6.4 million won for women (30 years). About 50% of their lifetime dental expenditure for diabetics incurred after age 65. Conclusions : Dental care pro fessionals should always effort to control risk factors in diabetics under 65 years to reduce dental expenses and improve to oral health promotion.