Asked by: Rebecca Gill, Leatherhead
We evolved from hominids that had longer jaws for chewing raw meat and plants. Extra molars are an advantage, but they don’t emerge until adulthood. This gives the jaw time to grow large enough to accommodate them.
As teeth are widest at the top, spaces between them can also emerge as the molars start to wear down. The new teeth at the back encourage the remaining teeth to shuffle up and close the gaps. We don’t need wisdom teeth any more, nor do we have enough room for them. But dentistry offers a quicker fix than evolution.
Luis trained as a zoologist, but now works as a science and technology educator. In his spare time he builds 3D-printed robots, in the hope that he will be spared when the revolution inevitably comes.