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Bidirectional relations between cognitive function and oral health in ageing persons: a longitudinal cohort study.

Research output: Contribution to journalArticle

Jing Kang, Bei Wu, David Bunce, Mark Ide, Vishal Aggarwal, Sue Pavitt, Jianhua Wu

Original languageEnglish
Pages (from-to)793-799
Number of pages7
JournalAge and Ageing
Issue number5
Published24 Aug 2020


King's Authors


Background: evidence suggests a reciprocal relationship between cognitive function (CF) and oral health (OH), but no study
has demonstrated this inter-relationship in a longitudinal population.
Objective: to investigate the bidirectional relationship between CF and OH in an ageing cohort.
Design: cohort study.
Setting: general community.
Subjects: participants from the English Longitudinal Study of Ageing.
Methods: OH, measured by teeth status, self-reported OH and OH-related quality of life (OHRQoL), and CFs were collected
at three time points in 2006/07, 2010/11 and 2014/15. Cross-lagged structural equation models were used to investigate the
association between CF and OH, adjusted for potential confounding factors.
Results: 5477 individuals (56.4% women) were included (mean age = 63.1 years at 2006/07, 67.2 at 2010/11 and 70.4 at
2014/15, SD = 8.9) in analyses. The average CF score was 46.5(SD = 12.3) at baseline and 41.2 (SD = 13.4) at follow-up.
3350 (61.2%) participants had natural teeth only and 622 (11.2%) were edentulous. In the fully adjusted model, better
cognition at baseline was associated with better OH at follow-up (beta coefficient = 0.02, 95% CI: 0.01–0.03); conversely
better OH at baseline predicted better cognition (beta coefficient = 0.12, 95% CI: 0.06–0.18). Similar magnitude and
direction of the reciprocal association was evident between cognition and OHRQoL.
Conclusions: This is the first longitudinal study to demonstrate the positive reciprocal association between CF and OH. The
findings suggest the importance of maintaining both good CF and OH in old age.

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