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When you are ready to brush, toothpaste inadvertently slipped from the toothbrush, then you need to squeezethe toothpaste, and tilt45° toothpaste neither let toothpaste slipped, and make you more comfortable to use toothpaste
Hubei University of Technology College of art and design, China
Yao Huang Rui Chen Boyang Xu Ruihua Xu