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Dentistry
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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
后牙殆面上的沟裂是龋病发生的主要部位
The grooves in the biting surface of molars are major sites for dental decay
在每个牙的各个面上上下摩擦
Use an up and down scraping motion on the sides of each tooth
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)
您颊粘膜上的糜烂面出现多长时间了?
When did you find the erosion area on your buccal membrane?
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