Bacteria complete the job by causing decay.
细菌通过引起腐烂而完成这个变化。
Bacteria sticks to food debris in the teeth, causing decay.
细菌附着在牙缝中的食物残渣上，道致蛀牙。
Dental experts say the close-fitting ornaments can trap bacteria, causing decay and gum disease, and health officials in some states have barred their manufacture.
美国口腔协会专家指出，紧紧箍住牙齿的装饰牙套会滋生许多细菌，很可能导致牙龈溃烂或引发其它口腔病。美国一些州已做出决定禁止生产装饰牙套。
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