17/01/2026
Your teeth may reveal more about your life expectancy than you realize.
A major new japanese study from the University of Osaka has found a significant link between oral health and overall survival in older adults.
In a large analysis of over 190,000 people aged 75 and older, researchers discovered that the number and condition of remaining teeth can be associated with all-cause mortality risk.
Those with more decayed or missing teeth had a higher likelihood of earlier death, while healthy and well-restored teeth were linked to lower mortality risk.
Unlike simple tooth counts, this study distinguished between sound (healthy), filled (treated), and decayed (untreated) teeth. The results suggest that a greater number of sound and filled teeth was more predictive of longevity than counting teeth without regard to their condition.
Scientists behind the research propose several mechanisms:
Functional impairment from missing or decayed teeth can weaken chewing ability and reduce nutritional intake, especially in older adults.
Persistent oral inflammation may contribute to systemic stress on the body.
Importantly, the authors make clear that tooth loss itself isn’t necessarily a direct cause of earlier death — it may also be a signal of other underlying health and social factors (for example, systemic disease or limited access to dental care).
This study adds to a growing body of evidence showing that oral health is deeply connected to overall health — particularly in later life.
📄 Source:
Otsuki, N., Yamamoto, R., Mameno, T. et al. Assessing the effectivity of counting the number of teeth with their conditions to predict mortality: the OHSAKA study. BMC Oral Health (2025).
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