你们既是无酵的面，应当把旧酵除净，好使你们成为新团。
Purge out therefore the old leaven, that ye may be a new lump, as ye are unleavened.
你们既是无酵的面，应当把旧酵除净，好使你们成为新团。
Take away, then, the old leaven, so that you may be a new mass, even as you are without leaven.
结论：超声工作尖的侧面能更有效地去净牙石和菌斑，且对牙根面损伤小；
Conclusion:Calculus and plaque can be cleaned more effectively and the damage is less severe by using the side of work tip.
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