# Dentition‐Cognition Relationship in Aging Populations: A Meta‐Analysis of Longitudinal Data

## TL;DR

Tooth loss is linked to increased risk of cognitive decline in older adults, with dentures helping to reduce this risk.

## Contribution

This study provides longitudinal evidence of a dentition-cognition relationship and identifies denture use as a mitigating factor.

## Key findings

- Tooth loss is associated with increased dementia and MCI risks in aging populations.
- Edentulism shows higher risks for cognitive decline compared to partial tooth loss.
- Denture use reduces dementia risk in individuals with tooth loss.

## Abstract

Recent research suggests a potential link between tooth loss and cognitive decline among the elderly population, but longitudinal evidence remains limited.

This meta‐analysis aims to investigate the longitudinal relationship between dentition status (tooth loss/edentulism) and cognitive outcomes (dementia/MCI) in aging populations.

A systematic search was conducted across PubMed, Scopus, and Web of Science up to February 2025. Twenty‐one longitudinal studies (N = 35 744 989 participants) meeting inclusion criteria were analysed. Pooled odds ratios (ORs) with 95% confidence intervals (CIs) were calculated using random‐ or fixed‐effects models. Study quality was assessed via the Newcastle‐Ottawa Scale.

Longitudinal evidence supports a connection between tooth loss and cognitive decline. Specifically, tooth loss was associated with increased risks of dementia (OR = 1.26 [1.07, 1.49]) and MCI (OR = 1.40 [1.14, 1.71]). Edentulism showed higher risks (dementia: OR = 1.16 [1.09, 1.23]; MCI: OR = 1.90 [1.07, 3.35]). Subgroup analyses revealed greater risks in women and Western populations. Denture use mitigated dementia risk in individuals with tooth loss (OR = 1.03 [0.82, 1.28]).

Tooth loss may accelerate cognitive decline, with more severe loss correlating to greater deterioration. Dentures could help mitigate this effect by restoring chewing function. Given that tooth loss is a modifiable risk factor for cognitive impairment, preventive dental care and timely prosthodontic treatment may play a protective role in maintaining brain health among older adults.

Tooth loss is a risk factor for cognitive impairment in longitudinal studies. The application of dentures can alleviate the side impact of tooth loss on cognitive decline.