| 摘要 |
PROBLEM TO BE SOLVED: To reduce the dangers of damaging the inside of the mouth and to cleanly, safely and comfortably improve the effects of massage. SOLUTION: For a hard material with a smooth surface such as a metallic body and a ceramics body, the loads of friction are less, there is the effect of improving blood circulation as well when it is warmed and used and the massage is performed safely, cleanly and comfortably.
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