Oh Jiang He, I love it when you're researching for mundane things!
Xu Qing's right that even though you don't need school to become an adult, it really does help. But I like that Jiang He draw on it. I always had second hand stuff, so I would always encounter this kind of stuff in my textbooks. I drew in other places, not on them though.
I like that Jiang He actually joined the family groupchat. It shows how much close she has become to the family. She and Xu Qing have really changed, although Xu Qing's dad still doesn't believe it.
Teeth pain is something I experience a lot as a child. I once cracked my own tooth trying to bite chocolate, making look like a shark tooth. It made for some fun nicknames. But the times where my mouth would get bloody always scared me.