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T-brush (Telescopic toothbrush)
People have a lots of teeth, and have difference shape, like molar tooth need to wide bristles and canines need finer bristles. The width bristles of the traditional toothbrush can't adjust and change, so this design focus on adjust the toothbrush's bristles.
Such changes can ensure the health of the teeth, when toothbrush without used and dry, all the bristle can rewind in the toothbrush, to avoid contamination.