Association of Social Support With Oral Health in Older Adults: A Systematic Review and Meta-Analysis

Social support is an important determinant of health in later life, yet no study has synthesised the relevant evidence. This systematic review and meta-analysis aimed to synthesise evidence on the association between social support (functional, structural, and perceived dimensions) and oral health among older adults aged 75 years and over.

The review process, using a systematic approach and random-effects meta-analysis, was conducted in accordance with PRISMA guidelines. Searches were carried out in Medline, Embase, and CENTRAL up to November 2025. Eligible studies examined associations between social support and oral health, including dentition status, oral conditions, oral function, oral health behaviours, and oral health-related quality of life. Risk of bias was assessed using the Newcastle-Ottawa Scale.

Forty studies were included. Meta-analyses showed that low functional support-defined as having fewer people to rely on-was associated with edentulism (OR 1.21, 95% CI: 1.15, 1.27) and non-regular dental service use (OR 1.20, 95% CI: 1.17, 1.23). Low structural support, in terms of living conditions, was associated with edentulism and lacking functional dentition (OR 1.34, 95% CI: 1.02, 1.75; and OR 1.41, 95% CI: 1.20, 1.67, respectively). The evidence on the associations between low social support and other oral health measures was sparse and heterogeneous.

Poor social support was associated with poor dentition status and oral health behaviours among older adults aged 75 years and over. These findings underscore the importance of incorporating psychosocial factors into oral health assessment and care planning for this population.

PROSPERO; registration number: CRD420251231319.