dental calculus

• 牙垢,牙石,牙积石

dental calculus的用法和样例：

例句

1. With aging, the detectable rate of gingival bleeding and calculus was increasing, the prevalence of JP was also increasing.
   随著年龄的增长，牙龈出血及牙石的检出率逐渐上升，牙周炎的患病率也逐渐增高。
2. Could you remove my dental plaque?
   请除去齿石。