system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do we get milk/baby teeth then lose them?

It seems a bit redundant to grow a set of teeth then lose them just to grow another set back? Are milk teeth different in terms of composition to your permanent teeth?
gpt
This is part of the growth process.  Teeth are not like other bones.  The bone in your arm can just grow as you grow, but teeth do not grow, so when you need bigger teeth to fit into your bigger mouth, the solution is to grow entirely new teeth.