牙齿的颤动是由于寒冷或愤怒。
亚洲人用牙线清洁牙齿的比例更高吗？
最后，支撑牙齿的骨头损坏，开始萎缩。
Finally, the bone supporting the teeth is attacked and starts to shrink.
鳄鱼就是这样清洁牙齿的。
它对牙齿的健康有益。
生物人类学家克里斯蒂·特纳是分析人类牙齿的物理特性变化的专家。
The biological anthropologist Christy Turner is an expert in the analysis of changing physical characteristics in human teeth.
对牙齿的分析还表明，纳-德内人和爱斯基摩-阿留申人后来还有过两次迁徙。
Tooth analyses also suggest that there were two later migrations of Na-Denes and Eskimo-Aleut.
糖通过被那些存在我们牙齿的引起斑块的细菌作为一种食物来源，可以导致牙齿腐烂。
Sugar can cause tooth decay by being used as a food source for the bacteria found on our teeth, which causes plaque.
在很长一段时间里，我们认为所有有牙齿的鲸鱼，包括抹香鲸和虎鲸，彼此都是密切相关的。
For a long time, we assumed that all whales that had teeth including sperm whales and killer whales were closely related to one another.
下町的已婚妇女保留了染黑牙齿的习俗。
The married women of Shitamachi maintained the custom of blackening their teeth.
四足动物的脖子通常很长，这样它们就可以毫不费力地够到食物，但是大象的脖子很短，这样它就可以更容易地支撑它巨大的头和沉重的牙齿的重量。
The neck of four footed animals is usually long, to have them reach their food without difficulty, but the elephant has a short neck, to make him more easily support the weight of his huge head and heavy teeth.
她花了两年的时间试验，以得到一个既美味又不伤害牙齿的食谱。
She spent two years conducting trials to get a recipe that was both tasty and tooth-friendly.
它窄长的头骨、没有牙齿的尖颌和短短的颈椎表明，它与无齿翼龙类似。
Its elongated skull with toothless tips and short cervical vertebrae indicate that it is similar to that of Pteranodon.
它们牙齿的数目都是混合的；宽吻海豚有88颗牙齿，伪虎鲸有44颗牙齿，全齿鲸有66颗。
Their number of teeth is mixed; a bottlenose has 88 teeth, a false killer whale has 44 teeth, and a wholphin has 66.
在她父亲的允许下，她用接下来的两年时间在网上进行调查研究，并进行实验。最后研制出既美味又不伤牙齿的食谱。
With her dad's permission, she spent the next two years researching online and conducting trials to get a recipe that was both tasty and tooth-friendly.
比霸王龙拥有更多牙齿的新生代。
2分钟时你清洁所有牙齿的最低时间。
Two minutes is the minimum time you need to clean all of your teeth.
黄色的部分则是鹦鹉螺牙齿的残留部分。
切记牙齿的内侧和咬合面都要刷到，舌苔也要刷哦。
Remember to brush the inside and chewing surfaces of your teeth, as well as your tongue.
牙齿的尺寸和形状与现代人已经很接近了。
The size and shape of the teeth are very similar to those of modern man.
关于他的新牙齿的一些事让他看起来很可笑。
但是幸运的是，有许多美白牙齿的产品可供选择。
But luckily for us, there are tons of whitening products to choose from.
喝红茶可以防止牙菌斑的形成，还可以杀死感染牙齿的细菌。
Drinking black tea has been found to prevent dental plaque formation and to kill bacteria that infect teeth.
这听起来就像我用我的舌钉敲击我牙齿的声音，如果我有的话。
That’s what it might sound like if I had a tongue stud, hitting my teeth.
阿姨准备了适合你吃不伤牙齿的糖，欢迎到时来尝尝。
Aunt is ready for you to eat the teeth do not hurt the sugar, to taste, welcome to.
一项研究发现，果味茶对牙齿的损害是橘子汁的三倍。
Fruit-flavoured tea can be three times more damaging than orange juice, a study found.
首先，氟能够使你牙齿的釉质更坚固，同时降低酸性的腐蚀程度。
First, fluoride makes your tooth enamel stronger and less likely to suffer acid damage.
那个时候也采用锶，它有助于坚固牙齿和减少牙齿的敏感。
Strontium was introduced at this time as well, which serves to strengthen teeth and reduce sensitivity.
一些专家还认为，其所含的黄酮类物质可能抑制牙齿的菌斑。
And some experts believe its flavenoids may inhibit the growth of plaque on teeth.
一些专家还认为，其所含的黄酮类物质可能抑制牙齿的菌斑。
And some experts believe its flavenoids may inhibit the growth of plaque on teeth.
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