Oxygen and strontium isotopes, which are fixed in dental enamel at the time of tooth formation, were tested in 18 subjects.
在18件样本上检测了氧和锶的同位素。这两种元素在牙齿成型时，会固定在牙釉质上。
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。
Rather than analyse microscopic cracks in tooth enamel or the chemical composition of bone, as others had done, Strait's team took an approach more common to mechanical engineering.
斯特雷特研究小组采取了一个比机械工程更常见的做法，而不是像别人所做的一样，分析牙齿珐琅质里面的显微裂缝或骨头的化学成分。
Their technique measures the warping of tooth enamel inflicted by radiation, detected in electron paramagnetic resonance.
他们使用电子顺磁共振测定了辐射对牙釉质的影响。
First, fluoride makes your tooth enamel stronger and less likely to suffer acid damage.
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。
Rinse after a few minutes, because long-term exposure to the acid in the lemon can harm tooth enamel.
几分钟之后用清水漱口，因为长期接触柠檬酸对牙釉质有伤害。
An analysis of her tooth enamel suggests she ate fruit, nuts and leaves.
通过对牙釉质分析，她以水果，坚果及树叶为食。
A white spot appears on the enamel where the tooth has started to weaken inside.
牙釉上有个白色斑点，对牙齿内部的保护就减弱。
You need food, particularly sweet and sticky food, for the bacteria in your mouth to produce acids that will attack the tooth enamel (outer surface of the tooth).
你需要食物，特别是甜食和粘性食物，你口腔中的细菌就会利用它产酸并损害牙釉质（牙齿表面光亮的那一层）。
This was soon followed by the discovery that the addition of fluoride and fluoride compounds to toothpaste would strengthen tooth enamel against decay.
随后不久发现了在牙膏中添加氟和氟化物可以加强牙釉质抵御腐蚀。
She used a slither of tooth enamel the size of a nail clipping to trace his origins.
埃文斯通过大小相当于小钉的牙齿瓷釉（珐琅）质，来确定他的来历。
The reason is that the acidity in food and beverages causes tooth enamel to soften, and brushing right after eating an acidic meal strips enamel from the teeth, leaving them vulnerable to cavities.
食物和饮料中的酸性会造成牙齿釉质软化，马上刷牙容易得蛀牙。
"Your dentist can see if you're grinding, because areas of the tooth enamel will be worn smooth."
“你的牙医可以检查出你有没有磨牙，因为牙齿珐琅质的磨损区会是光滑的。”
This is because particular isotopes of strontium dominant within a geological region are digested by individuals living there and incorporated into their tooth enamel.
依据是在一个地质区域内主要的锶同位素在被生活在该地的个体消化以后会被融进牙齿的釉质中。
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。
The stomach acid from repeated vomiting can severely erode tooth enamel.
反复的胃酸呕吐会严重损坏牙釉质。
Because the citric acid can erode tooth enamel, either hold off on brushing your teeth after drinking lemon water or brush your teeth before drinking it.
柠檬酸可以腐蚀牙釉质，所以要么在喝了柠檬水之后稍停片刻再刷牙，要么先刷牙再喝柠檬水。
Tooth enamel analysis revealed they ate fruit, nuts and leaves.
—经牙釉质分析后显示，他们以水果，坚果和树叶为食。
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。
In the presence of sugars or starches, the bacteria produce an acid that attacks the tooth enamel.
在糖或淀粉的存在，细菌产生的酸，攻击牙齿珐琅质。
The root isn't covered with tooth enamel.
牙根是没有牙釉质盖住的。
ScienceDaily (Sep. 6, 2009) - it's been a mystery: how can our teeth withstand such an enormous amount of pressure, over many years, when tooth enamel is only about as strong as glass?
科学日报(2009年9月6日)——当牙齿上的牙釉质大约只有玻璃般强硬时，我们的牙齿这么多年来是怎样经受住一个如此巨大的压力的？
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。
Certain harmful oral bacteria feed on the sugars you eat to create acids that destroy the tooth enamel.
你摄入的糖分会“滋养”一些有害的口腔细菌，并产生有害牙釉质的酸类物质。
In just one hour, plaque bacteria will start converting sugar and starch particles into harmful acids that attack the tooth enamel.
短短一小时，已足够让牙垢膜细菌把糖份及淀粉质转化为有害的酸性物质，侵蚀珐琅质。
In just one hour, plaque bacteria will start converting sugar and starch particles into harmful acids that attack the tooth enamel.
短短一小时，已足够让牙垢膜细菌把糖份及淀粉质转化为有害的酸性物质，侵蚀珐琅质。
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