氟中毒会导致牙齿变色或表面缺陷。
Fluorosis can cause tooth discoloration or surface irregularities.
第三个问题：为什么人们的牙齿变色后衰老？
吸烟会使牙齿变色。
人们还可通过电脑远程控制该装置，使得牙齿变色甚至不断闪烁。
People can even get a computer by which to control the contraption, making the teeth change colors or even blink.
由于一些常见的食物可能会导致牙齿变色，所以你得注意你所吃的东西。
There's another reason to watch what you eat - some common foods can cause tooth discoloration.
此患者曾在儿时(牙齿发育钙化期)服用了四环素类药物，导致了牙齿变色。
The patient had been in childhood (calcification period of tooth development) using the tetracycline class of drugs, resulting in discoloration of the teeth.
除了心率增加的可能性之外，还有无法入眠和使牙齿变色。 这是一杯咖啡对你健康的身体造成的伤害的两外一种方式。
Aside from the possibility of increased heart rate, trouble sleeping and discoloration of teeth, there's another a way that a cup of joe can be detrimental to your well being.
香烟中的尼古丁不仅会使你的牙齿以及你家的墙变黄，而且还会使你的手指和指甲变色。
The nicotine in cigarette smoke can not only make your teeth (and the walls of your home) brown, but it's also notorious for staining fingers and nails as well.
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.
病人：我的牙齿断了。牙神经已死，牙已变色，怎么办?。
Patient: I fell and broke my tooth. The nerve died, so the color has changed. What should I do?
但做完根管治疗的牙齿通常会慢慢变色，在前牙可能会影响美观，若病人在意的话，可做上金属瓷牙或全瓷冠。
But finished his teeth root canal therapy usually will gradually change color, front teeth may affect the appearance, if the patient care, can be done on metal ceramic tooth or all-ceramic crowns.
18岁男性患者，26号牙齿的牙冠中面出现缺损，中面及远中面的汞合金修复出现边缘恶化现象。上颚沟变色。
A18 year old male patient, mesial lesion in relation to 26. Mesial and distal amalgam restorations with marginal deterioration. Discoloured palatal groove.
方法：对临床6年期间用金属烤瓷方法修复的各种牙齿缺损、缺失、变色、畸形、错位等共720名患者计750件修复体的临床观察。
Methods 750 metal-porcelain prostheses in 720 clinical cases such as dentition defect missing, discoloration, abnormity and allotopia etc have been investigated and analysed during 6 years.
方法：对临床6年期间用金属烤瓷方法修复的各种牙齿缺损、缺失、变色、畸形、错位等共720名患者计750件修复体的临床观察。
Methods 750 metal-porcelain prostheses in 720 clinical cases such as dentition defect missing, discoloration, abnormity and allotopia etc have been investigated and analysed during 6 years.
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