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human
ELI5: What causes adult teeth to push out baby teeth?

I was looking at a picture of a child’s skull (totally recommend, it’s nightmarish and cool) and it got
me wondering: what causes the adult teeth to push out the baby teeth?
gpt
It’s not so much a “push.”  It’s more like this: you got your set of baby teeth. Then this adult tooth bud grows (think of it as a seed in dirt).  As it’s growing, it’s just growing upwards from its bud as a plant would. As it grows, it eats away (resorbs) the bone and tooth ahead of it (the baby tooth). And your baby tooth gets loose when there’s no more root left to hold it into jaw bone. That’s when you wiggle and it come loose and the adult one grows up out of the gum.