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【趣味学英语-当你睡觉时你的身体在做什么（3）】
3. GRINDING YOUR TEETH 磨牙

Most people grind their teeth while they are asleep, at least sometimes. This habit, called bruxism, can be caused by emotional or psychological states like stress or anxiety, from an abnormal bite (misalignment of your teeth), or even from sleep apnea. Most people are unaware they do this until their dentist notices evidence of unusual wear. If you're damaging your teeth at night, your dentist can give you a mouth guard to prevent it.
多数人在睡觉的时候都会磨牙，至少总有那么几次。这种磨牙症可能是由压力或焦虑等情感或心理状态引发的，也可能是由牙齿不齐导致的，甚至可能和睡眠呼吸暂停有关。在牙医发现不寻常的磨损痕迹之前，多数人都没有意识到自己磨牙。如果你睡觉的时候磨牙，牙医可以给你一个口腔防护器来预防损伤。