But we can regrow them. We just evolved an anti-teeth-regrowth substance/molecule that's in our blood and shuts down teeth growth once adult teeth are finished, because adult teeth roots are so deep that they require surgery to pull the old teeth out to make space for new. Also historically humans didn't live that long, compared to the decade it takes adult teeth to grow.

They're doing phase 2 trials in Japan right now, on children with a birth defect that blocked some teeth from spawning.

The medicine is a monoclonal antibody "antiserum" that neutralizes the teeth-growth-blocker.

It’s not the hard part that’s hard to replace but rather the rooting to the alive part.

So what I’m hearing is that they’re rocks that are alive.

When we replace them, we do use rocks though.

There's a difference between the food that's been eaten over the past thousands of years and the food that we all eat today. I suppose if you look at this the right way, it's another argument in favor of evolution. Teeth are optimized for hunter/gatherer diet and lifespans. Doesn't matter if your teeth rot out by 50 if you die in your 30-40s

Only the type of food we eat in an “advanced” society