The faster the pulse repetition rate, the wider the spacing between the teeth, making each individual tooth easier to identify.
脉冲重复率越高，齿间距越大，各个齿之间也越容易分辨。
Children need protein, vitamins, and minerals (especially calcium and phosphorous) to build strong teeth and to resist tooth decay and gum disease.
儿童需要蛋白质、各类维生素和矿物质(尤其是钙，磷)强健牙齿，抵御牙齿被腐蚀和预防牙龈疾病。
The tooth also had all the components of normal teeth, including enamel, crown and root, and connective fibers to fix it to bone.
培育的牙齿还具备正常牙齿的所有组成成分，包括釉质、齿冠和牙根，以及使其固定于骨头的结缔组织纤维。
To see how the brain responds to pain emanating from different teeth, the researchers used fMRI to monitor changes in activity when the upper tooth or the lower tooth was zapped.
为了分析大脑如何对不同牙齿的痛疼作出反应，研究人员利用功能磁共振成像监视上牙或下牙在受到脉冲刺激时的活动。
The only reason to have titanium teeth? Medical reasons, he says, like "if a dog breaks a tooth... it's the same as a crown for a human."
他说，狗嘴里镶钛牙的唯一的理由，只能是因为牙科医学上的原因，“如果狗牙断掉了，也可以像人的牙齿一样，作一个牙冠镶嵌在上边。”
Saliva helps protect teeth and gums from bacteria that cause cavities and gingivitis. So a perpetually dry mouth is more susceptible to tooth decay and gum disease.
唾液可以保护牙齿免受引发牙齿腔洞和牙龈炎的细菌感染，所以长期干燥的口腔更易患这两种疾病。
As bone and teeth are very similar in their structure, a team of scientists at the National Institute for Health and Medical Research in Paris tested if the hormone could stimulate tooth growth.
不过近期的研究表明，它在刺激骨质再生方面作用也非同小可。由于骨骼和牙齿在结构上非常相似，因此巴黎一家医学研究所的科学家对这种激素能否刺激牙齿生长进行了试验。
I have a root canal filling in one of my teeth. The tooth is changing color. Can anything be done about it?
我有一颗牙在牙根管里补过。现在这颗牙变了颜色，有什么办法可以解决？
Tooth transplantation is a more successful method to rapidly correct the individual malposed teeth and restore some lost teeth.
结论自体牙移植术是一种较为成功的治疗方法，能快速矫正个别牙错位及修复一些缺失牙。
My tooth stays loose. The other kids do not have loose teeth. It's just not fair.
我的牙齿松了。其他孩子的牙齿却没有。真是不公平。
There are more than 200 genes controlling and adjusting teeth development. They decide tooth position, number, size and shape, etc.
在牙齿的发育形成过程中有多达200多个基因参与调控，它们决定各个牙齿的位置、数目、大小和形状等。
In clinic, we often can find out many patients who have teeth irregularly and malocclusion caused by intermaxillary tooth size discrepancy.
在临床上，我们常常可以见到因为颚间牙齿大小的差异，导致牙齿排列不整齐的病人和异常的咬合。
Objective to analyze the effect of preserving severely damaged teeth such as stubbed tooth root, crown and vertically fractured tooth through compositive therapy.
目的利用综合治疗，对残根、残冠、纵折牙等严重缺损牙进行保存治疗并分析其疗效。
As the gap of teeth of internal matins gears with small tooth number difference is small, several teeth will mate simultaneously after the teeth are deformed by load.
渐开线少齿差齿轮副，由于是内啮合，齿轮副的齿对之间的间隙很小，在受力后轮齿变形而使得同时有多对齿啮合。
The new cycloid cam sliding tooth transmission is a two-teeth difference sliding tooth planetary gearing with cycloid internal gear.
新型摆线凸轮活齿传动是一种内齿轮齿廓为摆线及其等距线的二齿差活齿行星传动。
Faustick has cleaned his teeth after every meal for thirteen years and has not had a single decayed tooth.
福斯蒂克已经连续13年每顿饭后都刷牙，一颗蛀牙也没有过。
It is a common myth that losing baby teeth due to tooth decay is insignificant because baby teeth fall out anyway.
这是常见的误区，认为宝宝因为蛀牙失去牙齿是无关紧要的，因为宝宝的乳牙总会在将来某一天脱落。
Bacteria living on teeth convert sugar into lactic acid, which erodes enamel and causes tooth decay.
牙齿表面的细菌会把糖转变成乳酸，腐蚀珐琅质并导致蛀牙。
Apples also act as a toothbrush, cleaning teeth and killing bacteria in the mouth, which may reduce the risk of tooth decay.
苹果还有牙刷作用，洁齿和杀灭口腔细菌，减少龋齿的危险。
Tooth decay begins when teeth are not cleaned properly after eating.
进食后没有适当清洁牙齿，是蛀牙的导火线。
Plaque is the sticky film of bacteria that forms on the teeth and produces acids which dissolve the tooth enamel.
牙垢膜是由牙齿表面细菌形成的黏膜，会制造酸性物质并侵蚀珐琅质。
A tooth adapted for tearing apart flesh especially one of the last upper premolar or first lower molar teeth in carnivorous mammals.
裂齿，食肉齿适合于撕裂肉的牙齿，尤指食肉哺乳动物最后上前臼齿之一或第一个下臼齿。
Over-whitening can also cause teeth to become thin and brittle and can lead to high sensitivity and discoloration as tooth enamel becomes translucent.
美白牙齿过度，会使牙齿变得薄弱。同时，由于牙釉质变为半透明状，会导致牙齿高度敏感、变色。
Over-whitening can also cause teeth to become thin and brittle and can lead to high sensitivity and discoloration as tooth enamel becomes translucent.
美白牙齿过度，会使牙齿变得薄弱。同时，由于牙釉质变为半透明状，会导致牙齿高度敏感、变色。
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