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We do not know how much toothpaste squeeze when each time we brush . Now we color to distinguish
between the two red line in the boothbrush (red line within the area that the number of the amount) .
East china jiao tong university
Nanchang city, China
East china jiaotong university
nanchang jiangxi, China
Wenyu Hu Yuecen Han Junbin Liu Shuai Zhang