A dental cavity is a hole in the tooth. A cavity is caused by bacteria in the mouth. Brushing your teeth frequently and regularly can help prevent cavities.
蛀牙是指牙齿上有了窟窿，蛀牙由口腔中的细菌引起的，经常且有规律的刷牙有助于预防蛀牙。
A cracked tooth can be caused by biting down on something hard. Dentists treat a cracked tooth by covering it with a crown.
裂齿可能是咬到坚硬物质引起，牙医采用牙冠覆盖来治疗裂齿。
A dental X-ray is a picture of your teeth and gums. An x-ray shows what can't be seen on the surface of the teeth and gums.
牙科X光片是关于牙齿和牙龈的影像，X光片显示牙齿和牙龈表面肉眼不可见的物质。
Braces are used by dentists to straighten teeth over a period of years. Though braces are usually for children, they can also be used for adults with crooked teeth.
牙医使用牙套矫正牙齿已经很多年了，虽然牙套通常用于孩子，但也可以用于牙齿畸形的成年人。
To extract a tooth, means to remove it from the mouth. Dentists have to pull hard to extract a tooth.
拔牙是指把牙齿从嘴里拔出来，拔牙过程很费力。
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