为什么我们有智齿?

维多利亚:是的，据我所知，情况就是这样。我们的祖先需要智齿。正如许多人在痛苦中所知道的那样，长牙要晚得多(在18到25岁之间)。这就是为什么它们被称为智齿。当你得到它们的时候，你会更老更聪明。据说。我们的祖先，当他们过去吃生肉，到处觅食，吃很多粗粮时，会磨掉他们现有的牙齿。它们必须使用非常有力的下颚，咀嚼更多的东西。后来他们又长出了一副备用牙齿。克丽丝:我只有一个，而且还没有发过来。 I went to the dentists about five years ago and he said let's do an x-ray and see where your wisdom teeth are and there was one wisdom tooth. I asked him why he thought I only had one as most faces are set up symmetrically. There must be some kind of developmental thing - the cells that make that tooth didn't turn up in that bit of my jaw.