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According to a research, 45% of brush users have experienced the hurt of gum caused by the head of tooth brush.
In order to solve this problem, Air-Toothbrush devised an air sac at the head of the brush..
Whenever the brush unconsciously hits the gum,the air sac will relieve the pain by deforming.
JinFeng/Lei Long/Zeng XuJiang/Zhao Yao/He