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The toothpaste and toothbrush of combined as a whole ,and the principle of syringe .According to the outer wall of calibration control quantity of toothpaste .To protect human health and save use toothpaste.The toothbrush head front all adopt arc design avoid using injured children.
Shandong University of Science and Technology
Qingdao, China
Qiuju Yu,
Shandong University of Science and Technology