The root isn't covered with tooth enamel.
牙根是没有牙釉质盖住的。
As we age, the outer layer of tooth enamel wears away.
随着年龄增长，我们牙齿外层的釉质会慢慢地磨损。
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。
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。
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。
Outer layer of the tooth enamel and ivory to protect the pulp quality.
牙齿的外层有珐琅质及象牙质来保护牙髓。
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。
Saliva also bathes teeth in calcium, phosphate and fluoride, which strengthen tooth enamel.
唾液也能洗刷使牙釉质更加坚固的钙，磷酸盐和氟化物。
"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。”
The tooth enamel is softened by the acid and brushing straight after will wear the teeth down.
酸性物质会软化牙釉质，立即刷牙会磨损牙齿。
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。
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。
Contains fluoride to strengthen tooth enamel and reduce the risk of cavities caused by acidic food.
含氟配方，能强化牙齿珐琅质，有效降低口中因酸性物质引致蛀牙的机会。
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。
Fluoride is a naturally occurring mineral that helps to safely strengthen tooth enamel and prevents cavities.
氟是一种自然存在的矿物质，能安全有效地巩固珐琅质，防止蛀牙。
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。
The results showed that these bacteria can make demineralization of tooth enamel and produce caries-like lesions.
结果表明这五种细菌都可以造成釉质脱矿，产生龋样损害。
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。
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。
If your tooth enamel is porous, the colors contained in beverages easily absorb into it and your teeth lose their natural whiteness.
如果你的牙釉质不坚固，饮料的颜色就很容易渗入牙釉质，牙齿就失去了自然的洁白。
The constant composition method was used to study the kinetics of demineralization on dentine crystal, hydroxylapatite and tooth enamel.
应用等组分晶体生长方法 ，研究了牙本质晶、羟基磷灰石、釉质晶脱矿动力学。
The top grade silica abrasive, gently remove tooth surface dirt and tooth enamel surface doesn't hurt, often use, strong teeth, healthy mouth.
采用高档二氧化硅磨料，轻柔去除牙表面污垢的同时不伤害牙表面珐琅质，经常使用，强健牙齿，健康口腔。
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。
The effect of the 2nd-order annealing kinetics on ESR dating of ancient (early Pleistocene) fossil tooth enamel samples should be further studied.
二级过程的存在对ESR法测早期古人类遗址动物牙化石年龄的影响需进一步研究。
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。
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。
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，所以要么在柠檬水之前刷牙，要么先刷牙再喝柠檬水。
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，所以要么在柠檬水之前刷牙，要么先刷牙再喝柠檬水。
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