Objective: This research was undertaken to clarify the difference of the survival rate of those people who has more than 20 teeth of the age of 80 (8020) and those with average tooth numbers (control). Methods: The subjects were elderly resident who were 80 years old or above. The participants were examined by dentist and then divided into two groups that they had at least 20 teeth and they had less than 20 teeth. The baseline examination was conducted at 1992. The 8020 group was a total number of 24 males (82.3± 0.78 years old (average± SE)) and 35 females (81.7± 0.43 years old). Twenty four males (82.2± 0.77 years old) and 35 females (81.5± 0.40 years old) of the control group were picked to match with each participant of the 8020 group in accordance with their gender and age. Follow ups were conducted for a 10 years period until 2002. The accumulative survival rate was compared between the case group and the control group every 3 months from the baseline using the Kaplan-Meier method and the Log Rank Test. Results: The accumulative survival rate of the case group was higher than the control group at the 12, 15, 24, 27, 72 months of the male participants (p<0.1). The accumulative survival rate of the case group was significantly higher than the control group at the 18, 21 month of the male participants (p<0.05). There were no significant differences among female participants in both the case and control group. Conclusion: Females were not different but, male participants had higher survival rates compared with those without 20 teeth.

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