Tooth number

Tooth number decreases frailty in humans (RR 0.99 (95% CI 0.98-0.99)).

“For each additional tooth, the rate ratio (RR) for frailty was 0.99 [95% confidence interval (CI) 0.98-0.99] in the fully adjusted model.”

Humansin the fully adjusted model

Association Between Oral Health and Frailty Among American Older Adults

Journal of the American Medical Directors Association·25 Aug 2020

Tooth number is associated with cognitive function in humans (β = 0.338, 95% CI 0.229–0.447).

“Maintaining ≥20 teeth was associated with better cognitive function (β = 0.338, 95% confidence interval [CI]: 0.229-0.447)”

HumansChinese older adults maintaining ≥20 teethn = 8,283

Influence of the number of teeth on the cognitive function of older adults: an intermediary analysis based on dietary diversity

The journals of gerontology. Series A, Biological sciences and medical sciences·29 Sep 2025