Proof of this can be determined by dropping a baby tooth into a glass of it, then going back the next morning to find most of it eaten away.
我们来终结这个流言：将一颗牙齿仍在可乐玻璃杯里，第二天早上回来发现大部分被蚕食了。
My dentist always goes the extra mile, offering free back massages at the end of a stressful tooth extraction.
我的牙医总是非常尽心尽力，会在紧张的拔牙手术后给病人按摩。
This system can optimize the parameter of gears, check relief grinding of tooth back automatically and design the gear hobs rapidly and reliably.
该系统可优化滚刀设计参数，自动校核齿背铲磨，实现齿轮刀具快速可靠的设计。
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