... percent shunt index 释义：百分分流指数,分流指数百分比 hard calculus 释义：硬牙石含有高百分比的钙化物质 trend proportion 释义：百分比[率]趋势 ...
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Once plaque has hardened into calculus (tartar), brushing can't remove it. If you think you might brush too hard, hold your toothbrush the same way you hold a pen.
如果你认为刷牙可能太用力，握你的牙刷就想握一支笔一样。
In contrast, the KEY III is suitable for the treatment of soft tissue and hard tissue (enamel and bone), and in periodontology for gentle calculus removal.
相反，KEY III则适用于治疗软组织和硬组织(牙釉质和牙骨质)，在牙周病学中可轻柔地去除结石。
The hard, rough stains are calculus.
又粗又硬的着色的地方就是齿石。
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