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Dentistry
containing
面结
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主要是唾液中的钙离子沉积在牙面上的软垢中形成了牙结石
It is mainly calcium from the saliva which has formed hard deposits on the teeth
您牙面上坚硬粗糙的染色就是牙结石
The hard and rough stain is dental calculus
(tartar)
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