The purpose of this study was to examine changes in body mass index among elderly in royal denture bestowed project. The study design was a retrospective cohort study. Data collection was carried out in 436 subjects, from 6 months to 2 years after denture services. Multiple linear regression was used to analyses the relationship between denture use and body mass index adjusted for gender, age, income level and baseline body mass index. The results showed that the denture use significantly increased body mass index of elderly in royal denture bestowed project (P < 0.05)