Purpose：The purpose of this study was to investigate the effects of a prosthetic treatment and management plan on oral function and nutritional status in patients requiring removable molar denture treatment and having oral hypofunction.

　Methods：The participants were 20 outpatients aged 65 years or older who required removable molar denture treatment and having oral hypofunction（11 males, median age 77.5 years）. The participants received prosthetic treatment and a management plan that included an oral frailty measures program and nutritional guidance aimed at increasing dietary diversity. Oral function and nutritional status were assessed after 3 and 6 months.

　Results：The median number of items out of seven diagnostic items of oral hypofunction decreased significantly from the initial visit（4.0）to the 3-month（2.0）（p＝0.001）and 6-month visits（3.0）（p＝0.013）. No significant change was observed in body mass index, body fat percentage and muscle mass. Basal metabolic rate showed a significant change from the initial visit to the 3-month and 6-month visits；however, pairwise comparisons at the initial visit, 3-month and 6-month visits showed no significant differences.

　Conclusions：For patients who require removable molar denture treatment and have oral hypofunction, an oral frailty measures program and nutritional guidance aimed at improving dietary diversity were found to be effective in improving oral function but not in improving nutrition after 6 months.