小心，病从口入!
[误] Beware! Disease comes from the mouth.
[正] Beware! A close mouth catches no flies.
注：这又体现了中英文思维角度的差异。一个是“入”，一个是“挡”。虽然说法不同，但都十分形象。
参考例句：A thorough brushing helps to freshen up your mouth 彻底刷牙有助于口气清新
