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人体有自己的生物钟，人的各种器官职能的发挥在不同时间里有其不同。本研究通过测试４０名青年学生的牙髓活力值，探讨人体牙齿的生物时间，结果认为上午牙齿对痛的刺激耐受力较强。
Human body has its own biological clock, human organs play a different role at different times have their differences. In this study, we tested the dental pulp vitality of 40 young students to explore the biological time of human teeth. The results showed that the teeth were more resistant to pain stimulation in the morning.