| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an ear stick for removing dirt in a house or stain on teeth. Ž<P>SOLUTION: Melamine foam (sponge) is adopted for removing dirt and stain, especially, stain attached to the teeth and caused by tar, tea, and coffee, etc. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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