牙齿有一层叫做釉质的坚硬表层。
另一个持久的症状通常是牙釉质发育不全。
反复的胃酸呕吐会严重损坏牙釉质。
The stomach acid from repeated vomiting can severely erode tooth enamel.
最近表明，小孩子的牙釉质极易受酸侵蚀。
In young children, teeth that have recently emerged have weak enamel and are highly susceptible to acid decay.
当龋坏扩散破坏到釉质下方，就进入了牙本质。
The decay reaches into the dentin, where it can spread and undermine the enamel.
通过对牙釉质分析，她以水果，坚果及树叶为食。
An analysis of her tooth enamel suggests she ate fruit, nuts and leaves.
他们使用电子顺磁共振测定了辐射对牙釉质的影响。
Their technique measures the warping of tooth enamel inflicted by radiation, detected in electron paramagnetic resonance.
牙根是没有牙釉质盖住的。
出于对损坏牙釉质的担忧，我退而远之。
I opt out, since it seems like it must wear down the enamel.
刷牙力气过大更容易损伤你的牙釉质。 。
Thee chances of enamel breakage are greater when you brush too hard.
开始可以只做釉质修整。
—经牙釉质分析后显示，他们以水果，坚果和树叶为食。
Tooth enamel analysis revealed they ate fruit, nuts and leaves.
“酸会损伤牙釉质，使其软化。”Dr .Jones说。
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。
Rinse after a few minutes, because long-term exposure to the acid in the lemon can harm tooth enamel.
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.
但是如果龋坏继续进行穿过表面的牙釉质，将会形成永久性损害。
But if the decay continues and breaks through the surface of the enamel, the damage is permanent.
唾液也能洗刷使牙釉质更加坚固的钙，磷酸盐和氟化物。
Saliva also bathes teeth in calcium, phosphate and fluoride, which strengthen tooth enamel.
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。
This was soon followed by the discovery that the addition of fluoride and fluoride compounds to toothpaste would strengthen tooth enamel against decay.
某些情况下，由于牙釉质变薄，牙齿需要做牙套保护或者拔除。
In some cases, teeth have to be capped or replaced because of thinning enamel.
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。
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.
可可碱似乎能修复牙釉质并保护牙齿免收酸性物质的进一步腐蚀。
Theobromine appears to help with repairing enamel and protecting teeth from further erosion by acids.
但是，这同样会由于增加了口腔酸性而腐蚀牙齿的保护膜，牙釉质。
However, they also increase mouth acidity which erodes dental enamel - the tooth's hard protective coating.
根据牙釉质的碳14比率，他们推算出受害人生于1955年至1961年间。
Based on the dental enamel's C-14 ratio, they calculated that the victim had been born between 1955 and 1961.
食物中的酸性物质会软化牙釉质，软化的牙釉质几分钟后才能恢复。
The acids in food soften the enamel, which takes a while to recover.
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。
Oxygen and strontium isotopes, which are fixed in dental enamel at the time of tooth formation, were tested in 18 subjects.
铑镀穿耳环与边框集白欧泊明星光芒水晶海韵；水晶珠和釉质元素不同颜色。
Rhodium-plated pierced earrings with bezel-set White Opal Star Shine crystal chaton; crystal beads and enamel elements in various colours.
它们能引起牙釉质表层的细微裂缝，进而随着时间的推移导致更大的牙齿问题。
They can cause microscopic cracks in the surface of the enamel, which could lead to bigger dental problems over time.
想要洗牙的患者如果担心牙釉质的损坏，可以要求牙医使用颗粒更精细的抛光膏。
Patients who remained concerned about enamel damage but want polishing can request the dental hygienist use a finer-grained paste.
想要洗牙的患者如果担心牙釉质的损坏，可以要求牙医使用颗粒更精细的抛光膏。
Patients who remained concerned about enamel damage but want polishing can request the dental hygienist use a finer-grained paste.
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