每当两个牙齿接触，有可能对细菌在它们之间。
Whenever two teeth are touching, there is potential for bacteria to be between them.
蛀牙发生时，牙齿受到攻击，酸，这可以发生在两个方面。
Tooth decay happens when teeth are attacked by acid, and this can happen in two ways.
不过，还有两个更为严重的健康问题，普通的牙病不只让人失去牙齿，还会失去性命：它们可能引发牙周病和口腔癌。
But there are two much more serious problems, common dental diseases that can lead not only to loss of teeth but also to loss of life: periodontal disease and oral cancer.
氟能够通过两个途径在细菌新陈代谢是你口腔成为酸性的时候保护你的牙齿。
Fluoride helps protect your teeth from the acid that is released when this happens. It does this in two ways.
或者，最令人印象深刻的是，她使两个女儿如此憎恨音乐课，以至于一个女儿的钢琴上竟然留了一个牙齿印。
Or, most memorably, makes her two daughters' music lessons so grueling that one girl leaves tooth marks on the piano?
然而事实是长时间的推迟看来是无可避免的了，只能在爆炸废墟的原始平面图上留下两个巨大的像丢失的牙齿一样的裂口了。
But the truth is that prolonged delay seems inevitable for the British-designed towers, leaving two huge gaps in the original masterplan for Ground Zero like missing teeth.
正如你所看到的，这幅肖像图主要有两个问题，牙齿上的淡黄色和某些牙齿间的缝隙。
As you see this portrait has two main problems, the slight yellow tint of the teeth and the gaps between some of them.
而采用家庭治疗，患者只需连续两个星期每天戴上涂有漂白凝胶的护齿两个小时就可以了。具体治疗时间取决于牙齿被染色的严重程度。
In at-home treatments, patients wear a mouth guard fitted with bleaching gel 2 hours a day for two weeks, depending on the severity of staining.
我的牙齿蛀了两个洞。
我们拿起我们留下了我们的教程2，但也有两个新的让伸进我们的牙齿了。
We pick up where we left off with two of our tutorials, but also have two new ones to get our teeth stuck into.
案件报告中，两名常任异位上颌犬齿绕过侧门，并造成了广泛的骨吸收两个上颌中切牙牙齿。
A case is reported in which two ectopic maxillary permanent canine teeth bypassed the lateral incisors and caused extensive resorption to both maxillary central incisor teeth.
有些牙齿化石已经被发现，其中两个最年轻的就可追溯到220万年前，这些牙齿已经很像储存毒液的凹槽。
Several have been found, and the two youngest ones, dating from 220 million years ago, have what look like venom canals.
他们不同意保存错误，因为两个完全没有牙齿破裂的物种证明了断裂不是由坑内磨损引起。
They rejected preservational bias because a total absence of breakage in two extinct species demonstrated that the fractures were not the result of abrasion within the pits.
拥有两个有力的前脚和像马刀一样的牙齿，它很容易埋伏到剑龙，并将它打倒，开始发动战斗。
With2 powerful hand-legs and saber-like teeth, it could easily ambush stegosaurs and bring it down, initiates fight.
所以我们把孩子放上车，载着他们到牙齿矫正医生那儿、到学校、到两个街区外的朋友家里，因为“如果我让他们自己走去，要是被绑架了，我永远不会原谅自己”。
So we put them in that car and we drive — to the orthodontist, to school, to their friend's house two blocks away — because "if I let them walk and they were abducted I would never forgive myself."
我的牙齿又白又亮，但我还是害怕其中的两个不够洁白。
My teeth are white and bright, but I'm afraid two of them are not neat enough.
方法：收集临床上因正畸需要拔除的前磨牙28颗，将每个牙齿分为近中和远中两个邻面标本。
Methods:28 human premolars extracted for orthodontic reasons were collected for the experiment. Every premolar was split vertically into medial and distal haves.
在短短两个星期，你可以有两个色调的牙齿更白。
In just two weeks, you can have teeth up to two shades whiter.
在短短两个星期，你可以有两个色调的牙齿更白。
In just two weeks, you can have teeth up to two shades whiter.
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