When she had just had her teeth extracted, Li Yiran would think of Ji Zhaozhen when brushing her teeth, and she would think of Ji Zhaozhen when eating to avoid the wound. She sometimes felt that the hole in her wisdom tooth was the same as the hole in her heart for so many years. She was careful not to touch the wound, but she kept thinking about it. She thought that the wound would eventually heal and grow into a smooth new alveolar bone, and maybe she would not think of Ji Zhaozhen again.
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Ji Zhaozhen looked at Li Yiran and spoke slowly, "I didn't have much idea when I applied for a volunteer. It didn't matter where I went. It just flashed through my mind. In my sophomore year of high school, you said you had a crooked wisdom tooth. I thought to myself, I might as well study dentistry."
Purpose: Li Yiran had a wisdom tooth that erupted in high school, and the pain recurred repeatedly. In the sixth year of knowing Ji Zhaozhen, he cured it.