(The young) Emperor Wucheng was starting to grow his wisdom teeth. He asked the imperial physicians why this was so, and the head physician, Deng Xuanwen, answered truthfully (that their eruption was a sign of maturation). Emperor Wucheng was displeased with the explanation and asked for him to be flogged. He then asked Xu Zhicai (another imperial physician). Xu congratulated the emperor and said: “These are the wisdom teeth, Your Majesty. Those who have wisdom teeth are wise and long-lived.” Emperor Wucheng was delighted, and rewarded him.