He says they actually use dental floss to slowly saw away at the metal, adding tooth powder to increase the friction.
但是犯人们总能找到办法弄到。现在他们用牙线慢慢钜金属，抹上牙粉增加摩擦力。
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Dental amalgams, the silver-colored material used to fill teeth after removal of a cavity, include liquid mercury and a powder that contains silver, tin, copper, zinc, and other metals.
Through its special metal porcelain dental materials and dental porcelain powder to help, have been sealed in a similar way dental crown on top, and then play a role in protecting root dentin.