Yea, I remember seeing a picture on reddit years ago where a squirrel, feasting on soft human trash, his teeth didn't wear down and grew outwards in concentric circles until he presumably starved from now not being able to chew even the softest of foods. I don't want to look up the photo, it's sad, but I think it was legit.

At first I read your comment as saying "feasting on soft human flesh" and had some very serious questions about the benefits of helping that squirrel fix its teeth again...

Your teeth are growing a bit, too. (Otherwise they would be grinded down, too)

But this is about regrowing a lost tooth.