Average life span of a Japanese tooth

Abstract

We investigated the relationship between the human life span and the life of the average tooth. Although Japanese woman live longer than men, the opposite is true for their teeth. We also found that longevity was different for each tooth. During the six years from 1987 to 1993 the increase in longevity of the average Japanese tooth was three times greater than the increase in the average life span. In order for people to achieve the goal of having 20 teeth by age 80, we must consider different preventive measures for each tooth.