What evidence have you discovered to explain how tissues are organized in the body similar to the way dots in pointillism art are organized

the answer to your question is tooth decay.

fumikage isn't really a bird, and tsuyu does have teeth. tsuyu has a transformation quirk which still allows her to be partially human. otherwise we'd have a large frog running around. fumikage has teeth because again, he isn't a bird. his head was a quirk mixture if i'm correct.