拔牙时所使用的高速牙科电钻可能使得气体进入软组织，进而导致皮下气肿及纵膈气肿。
The use of a high-speed dental drill may introduce air into the soft tissue and lead to subcutaneous emphysema and pneumomediastinum.
当你去看一个牙科医生，你希望他的拔牙工具是菜刀和电钻吗？你觉得这可能修复好你的牙齿吗？
When you go to a dentist, do you want him to have as bad a tool as possible to repair your teeth?
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