Dr. Yara Haridi

current baby tooth and it's just like lying in wait and like waiting to erupt.

And that's what we have.

Most mammals have just reduced it down to just the two stages, milk teeth and adult teeth.

There's one theory that it's because of chewing.

So our molars are shaped very specifically to fit together, right?

And they perfectly fit together in this like, it's called precise occlusion, fitting together really well.

Really hard to do if you're constantly changing your teeth.

So how do you have that consistent fitting together if that's not the case?

And so we think that maybe by evolving one, they had to lose the other potentially.

But yeah, mammals, basically, we just have the two.

But people are working on it, right?

Because we study sharks.

We study all kinds of animals that replace their teeth constantly because wouldn't it be nice?

Instead of getting crowns, they just pull that one out, put like a little stem cell implant and then have that grow.

And that's now in progress.

People are doing that with mice.

They were able to implant a tooth bud and grow a new tooth.

It was shaped a little funky, but it did well.

It still did well.

I'll get it next time.