One can also interpret it as that, once human learnt to use fire, cooked food made jaws and teeth less important, so people with bigger brain would reproduce mo

One can also interpret it as that, once human learnt to use fire, cooked food made jaws and teeth less important, so people with bigger brain would reproduce more, no matter how their teeth look like. There's also cultural difference in the aesthetics of teeth, for example, Japanese culture considers yaeba as cute.