名词
中文翻译：牙胶
同义词：
['gum softener', 'gum protector例句：1. The dentist uses a gum expander to remove old fillings and prepare for new ones.（牙医使用牙龈扩张器来去除旧填充物并为新的填充做准备。）2. This gum expander is designed to help children with braces by reducing the pressure on their teeth.（这个牙龈扩张器旨在帮助戴牙套的孩子，通过减轻对他们牙齿的压力。）']
例句：
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1. The dentist uses a gum expander to remove old fillings and prepare for new ones.
牙医使用牙龈扩张器来去除旧填充物并为新的填充做准备。
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2. This gum expander is designed to help children with braces by reducing the pressure on their teeth.
这个牙龈扩张器旨在帮助戴牙套的孩子，通过减轻对他们牙齿的压力。
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3. After using this gum expander, my gums feel much softer and less painful.
使用这个牙龈扩张器后，我的牙龈感觉更柔软，疼痛感减轻了。