Objective To investigate the effectiveness of an oral health education programme using a mobile app for adults aged 65?years or older. Methods Participants aged 65 or older were randomly allocated into non‐app use (n?=?25), app use (n?=?22) and control (n?=?26) groups. The non‐app use group received lecture‐based oral health education using PowerPoint presentations and participated in workbook activities twice a week for five weeks, whereas the app use group underwent oral health education using a smartphone app and workbook activities for five weeks. Before and after the intervention, a questionnaire survey and oral health examination were performed to examine changes in oral health‐related indices. Results The non‐app use group showed significant changes, with a 2.1 increase in oral health knowledge score, 0.2 decrease in the O’Leary index and 0.6 decrease in tongue coating. The app use group showed significant changes, with a 3.1 increase in oral health knowledge score, a 2.5 increase in oral health perception, a 0.3 decrease in the O’Leary index and a 1.4 decrease in tongue coating. Repeated‐measures ANOVA showed that interaction between time and group was significant only in tongue coating variable. Conclusion The smartphone app developed in this study carries the possibility to convey informative content for oral health education among older adults.
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