system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How are teeth made and why can't your body make additional ones?
gpt
Simply put, we don't have the biological process developed for this to take place. This would be an extremely complicated process, even compared to everything else already in your body. Your body would have to be able to recognize when its missing actual macro-parts of itself and build it and grow it like it does from when you were created. It's just something we simply don't have and never developed.

*Edit: I'd like to emphasize that it's not the building from scratched part that is the problem, as stated in a comment that is seen in tumors. What is the issue is the epicontrol of it all. Detecting when you don't have a tooth, when to build one, making sure you don't build one when you already have one (probably biggest problem, think cancer).