Tooth loss linked to higher dementia risk in new study

SINGAPORE, 27 SEPTEMBER 2026 —

Tooth loss in older adults linked to cognitive decline in Singapore study, but causality not proven

A Singapore study has found an association between tooth loss and reduced cognitive function among older adults, though researchers caution that the link does not prove tooth loss directly causes brain decline. Geriatrician Dr. Lim Zhiying of National University Hospital (NUH) suggests chewing may provide essential brain stimulation, with tooth loss potentially reducing this effect.

The study highlights a potential indirect relationship where diminished chewing efficiency—due to missing teeth—could contribute to cognitive challenges in aging populations. However, Dr. Lim emphasized that the research does not establish tooth loss as a definitive cause of cognitive decline, only an observed correlation.

The findings stem from a local study examining oral health and brain function in older adults, though specific details such as sample size, methodology, or statistical significance were not disclosed. Dr. Lim’s theory aligns with broader research suggesting sensory stimulation, including chewing, plays a role in maintaining neural activity.

The study’s limitations were underscored by its inability to determine causation, leaving open questions about whether poor oral health accelerates cognitive aging or if both conditions stem from shared underlying factors like poor nutrition or systemic inflammation.

For Malaysia, where aging populations face rising dementia risks, the study’s implications could influence public health strategies. While no direct policy shifts were announced, the findings may prompt discussions on integrating oral health into geriatric care, particularly in light of Malaysia’s growing elderly demographic. The Ministry of Health has previously highlighted oral health as a key component of overall well-being, though no immediate action was tied to this study.

The next step for researchers may involve longitudinal studies to clarify whether interventions like dental prosthetics or improved oral care could mitigate cognitive decline. Until then, experts recommend regular dental check-ups as part of holistic aging strategies.

Related: National University Hospital (NUH) · Dr. Lim Zhiying · Singapore