Oral frailty rates differed across communities in Japan
Among 42,987 adults in Japan aged 65 or older followed from 2019 to 2022, the share developing oral frailty ranged from 17.1% to 33.3% across municipalities.
Limit: Oral frailty classification relied on a prediction model using age, teeth, chewing difficulty, and choking
Edited by Boris Djordjevic · AgingResearch.News
An observational cohort study followed 42,987 adults aged 65 or older in Japan who completed surveys in 2019 and 2022. Oral frailty is characterized by tooth loss, chewing difficulty and swallowing problems. Researchers identified it using a validated prediction model based on age, number of teeth, chewing difficulty and choking.
Lower education and income, smoking history and current illness were among the individual factors associated with higher risk. Living in urban, semi-urban or rural-agricultural areas was linked to lower risk than living in metropolitan areas. Higher community-level civic participation—participation in community life—tended to be associated with lower risk, although this association was not statistically significant in every model.
Why it matters
Preventing oral frailty in aging populations may require addressing socioeconomic disadvantage alongside community efforts to encourage civic participation.
Caveats
Oral frailty was defined using a prediction model, and the observational design cannot establish cause and effect. The findings concern adults aged 65 or older in Japan who completed both surveys.
The paper
Community-Level Inequalities and Risk Factors for Incident Oral Frailty
Kanagawa Dental University
JDR Clinical and Translational Research, Oct 27, 2026
