| 摘要 |
PROBLEM TO BE SOLVED: To butt a minute part in an oral cavity with an oral cavity sponge body for cleaning the inside of the oral cavity and to absorb a butting shock by the top part of the sponge body. SOLUTION: On the outside surface of the oral cavity sponge body, recess grooves crossing the vertical direction of the sponge body are cut out at multiple levels, and a semispherical sponge body is protruded on the top face of the sponge body.
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