开口器用英语怎么说

开口器在英语中可以称为 "mouth opener" 或 "oral expander."
开口器是一种医疗工具，用于通过扩大口腔的内部空间来帮助患者改善口腔健康。它们通常用于治疗口吃、牙齿不齐或夹缝牙齿等问题。
下面是一些例句：
My orthodontist prescribed an oral expander to help correct my overbite. (我的正畸医生开了一个开口器来帮助矫正我的过多突出上颌。)
The mouth opener made it difficult for me to speak and eat at first, but it helped improve my bite over time. (开口器起初让我说话和吃饭都很困难，但随着时间的推移，它帮助改善了我的咬合。)
I had to wear the oral expander for several months before my teeth were properly aligned. (在我的牙齿正常排列之前，我必须戴上开口器几个月。)
希望这些信息对您有帮助。