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Enamel is the hard outer tooth layer.
牙釉質是牙齒堅硬的外層。
The cavity gets larger by entering the softer second tooth layer, the dentin.
蛀牙洞到了牙齒的較軟的第二層， 也就是牙本質時，齲洞就會變得大的多。
Does decay affect the dentin?
蛀牙對牙質有影像嗎？
Decay spreads quickly when it reaches the dentin.
蛀牙到了牙質時發展的很快。
The decay must be removed at this time because it'll soon reach the sensitive tooth pulp.
這時候應該把蛀牙治療，因為不久它就會侵入到很敏感的牙髓。
If this happens, there'll be death of the pulp, pain and infection into the jaw-bone surrounding the tooth.
要是蛀牙到了牙髓，牙髓就會壞死，牙齒四周的頜骨就會疼，就會發炎。
The tooth might have to be removed if this happens.
在這種情況下，這顆牙齒就要拔掉。
How can I prevent this?
該怎樣預防呢？
It's absolutely necessary to visit your dentist twice a year for dental check up to prevent infection and loss of teeth.
那就肯定要一年去看兩次牙醫， 進行檢查， 預防感染， 也預防牙齒脫落。
X-rays are a very important Part of a dental examination.
照 X光進行牙科檢查的一個重要部分。
X-rays are needed to find decay that's hidden from sight.
檢查看不見的蛀牙需要看X光。
What type of X-rays do you usually take, Doctor?
你通常使用的是什么種類的X光？
I usually take two different kinds of X-rays when I examine a patient.
我通常用兩種不同種類的X光檢查病人。
Periapical X-rays are needed to be able to examine the roots of teeth.
檢查牙根時需要進行齒根周圍的X光照射。
It also is needed to examine the surrounding tissues for signs of periodontal disease, impacted teeth, infections and cysts.
也需要檢查牙周圍的組織，找牙周病，嵌入牙， 感染和囊腫的征兆。
Does this X-ray find the cavities?
進行X光照射能發現蛀牙嗎？
This type of X-ray is not always effective for finding caries.
進行這種X光照射并不是一定有發現蛀牙的效果。
Cavity disclosing (bite-wing) X-rays are needed to supplement the periapical X-rays so that tooth decay can be diagnosed accurately.
需要用合牙翼片X光照射法作為齒尖周圍X光照射法的輔助， 以便對蛀牙做出正確的診斷。
