BackgroundBackground

Although previous studies have reported associations between the number of teeth and all-cause mortality, the results vary depending on the tooth condition. Few previous studies have focused on the most effective method of counting the number of teeth to predict all-cause mortality. This study aimed to identify an effective method for counting the number of teeth according to their condition in order to predict all-cause mortality.

MethodsMethods

This cohort study used data from the Oral Health Screening to Assess Keys of Aging Well (OHSAKA) study and linked public dental check-ups and healthcare administrative datasets in Japan from 2018 to 2020. A total of 190,282 participants aged 75 years or older who underwent public dental checkups in Japan were evaluated for the study. The exposure in this study was the number of teeth and their condition, excluding the third molars. The outcome measure was all-cause mortality using the National Health Insurance Database of Japan.

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