Though I think most would assume that straight or crooked teeth are genetic.

不过我觉得大多数人会认为是基因决定了你的牙齿整齐与否。

According to the fossil record, ancient humans usually had straight teeth, complete with third molars — or wisdom teeth.

根据化石记录，古人的牙齿通常都排列得很整齐，且是有第三臼齿或智齿的完整组合。

I understand that it hurts sometimes, but think of the beautiful, straight teeth you'll have in a few months' time!

据我所知，它有时会疼，但想想几个月后你将拥有美丽的，整齐的牙齿！

For your information, it is a very small step from junior to senior partner when you have straight teeth.

仅供参考 拥有好牙口的话从初级晋升为资深合伙人也就不远了。

Another effect of having the tongue on the roof of the mouth is that, especially when young, it widens the dental arch, which helps to have straight teeth.

舌头抵在上颚对嘴部的另一个效果是这样可以扩展牙弓，帮助牙齿生长的更平直，尤其是在人年少的时候。

Yes. My mum says I need braces to keep my teeth straight, but I don't want to wear them because my friends will laugh at me. What should I do?

是啊，我妈妈说我需要戴牙套来使我的牙齿保持整齐，但我不想戴，因为我的朋友会笑我的。 我该怎么办？

Rhesus monkeys, when left to their own devices will breathe through their noses with their mouth closed and their tongue resting on the soft palate, and they usally have properly functioning, straight teeth.

当恒河猴离开了他们自己的领地，他们就会闭起嘴巴，用鼻子呼吸，而舌头则搁置在柔软的上颚上，并且它们往往有一口好用的整齐牙齿。

One piece of evidence for the significance of having to chew more and harder is the fact that the skulls found with good occlusion with straight teeth are found with extensive wear on the teeth.

一个用更多次，更用力的咀嚼获得等量的卡路里有着重大意义的证据就是长着咬合较好且整齐的牙的头颅，它们的牙齿都发现有着大量的磨损。