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People have a lots of teeth, and have difference shape, like molar tooth need to wide bristles and gap between teeth need finer bristles. The width bristles of the traditional toothbrush can't adjust
and change, so this toothbrush's bristles design more detailed care for teeth health.
When toothbrush without used and dry, all the bristle can rewind in the toothbrush, to avoid contamination.
National Cheng Kung University
I Jui Lee