If your teeth show these signs, your dentist can give you a mouth guard.

如果你的牙齿出现这些症状，你的牙医会给你一个口腔护卫。

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In at-home treatments, patients wear a mouth guard fitted with bleaching gel 2 hours a day for two weeks, depending on the severity of staining.

而采用家庭治疗，患者只需连续两个星期每天戴上涂有漂白凝胶的护齿两个小时就可以了。具体治疗时间取决于牙齿被染色的严重程度。

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The gang tied up the security guard and put a gag in his mouth.

那帮歹徒把保安人员捆绑起来，然后把他的嘴堵住。

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Chalmers turned his back to him, inserted his mouth guard and walked toward the court.

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She recommends a custom-made mouth guard that is worn while patients sleep.

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Your dentist may recommend a mouth guard or appliance (a splint for the teeth) to protect the teeth and possibly prevent grinding.

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