A dental cavity is a hole in the tooth 牙洞是牙齒上有一個(gè)洞

A cavity is caused by bacteria in the mouth 牙洞是嘴里的細(xì)菌引起的

Brushing your teeth frequently and regularly can help prevent cavities 定期有頻次的刷牙能幫助預(yù)防蛀牙

A cracked tooth can be caused by biting down on something hard 牙齒破裂可能是由于用力咬東西引起的

Dentisits treat a cracked tooth by covering it with a crown 牙醫(yī)用牙冠覆蓋裂開的牙齒來治療

A dental X-Ray is a picture of your teeth and gums 牙科的X光 是你牙齒和牙齦的照片

An X-Ray shows what can't be seen on the surface of the the teeth and gums x光片展示牙齒和牙齦表面不能被看到的

Braces are used by dentisits to straighten teeth over a period of years 牙醫(yī)用牙套矯正牙齒 需要幾年時(shí)間

Though braces are usually for children，they can also be used for adults with crooked teeth 雖然牙套通常為小孩使用，也能被成年人使用矯正牙齒

To extract a tooth，means to remove it from the mouth 拔牙，意思是從嘴里移除

Dentists have to pull hard to extract a tooth 牙醫(yī)必須使勁拔牙

Dentisits often inject something into the gum to block the pain during the extraction process 在拔牙過程中，牙醫(yī)通常注入一些東西到牙齦里來止痛

Braces are used on people with crooked teeth or after an injury 牙套被用于牙齒歪和牙齒受傷后的人