system
Given the following post, respond as if you're commenting on Reddit:
human
Why can’t a human body heal teeth in case if it breaks or there is a cavity?

Everything in a human body can heal except for the teeth. Why did evolution leave that part. It perfectly makes sense to heal the part that plays a vital role in consuming food and surviving.
gpt
Evolution only selects for traits that are just good enough to be passed down, so not being able to repair damaged teeth just wasn’t necessary to survive long enough to reproduce. Also, teeth can heal to a small extent, just not enough to repair cavities or breaks.