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In daily life, we always find that the toothpaste is easy to drop from toothbrush to our clothes or the sink before we brush teeth. In this situation, most of people would choose to squeeze out carefully the toothpaste for the second time.
This design is just changing the circle toothpaste mouth to a square one which can increase the contact area and friction between the toothpaste and the toothbrush. Consequently, the toothpaste can be pressed closer against the brush.
Form the angle of production, this design does not add any procedure or cost. Meanwhile, this idea can save resources and protect environment in the long-term perspective.