Why do back teeth decay so easily?

为何后磨牙如此容易被侵蚀？

youdao

Apparently front teeth changed first, back teeth later.

非常明显，前面的牙齿先改变，后面的牙齿再改变。

youdao

By 1-2 years: teeth are duller and the back teeth may have some yellowing.

1 - 2岁，牙齿钝化，后槽牙或许还有点发黄。

youdao

We're sick to the back teeth of being told it's all our own fault.

BBC: Ireland votes on EU fiscal pact

Murray displays his teeth, throws back his head, laughs constantly, and speaks in Hudson Valley patrician tones.

NEWYORKER: Hyde Park on Hudson

It's my teeth, my lower back, and it was understood with my wife at the last election that I wouldn't stand again.

ECONOMIST: The incomparable Daniel Patrick