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This toothbrush is designed to make people to replace the toothbrush properly, by injecting a certain amount (can be used for two or three months)of toothpaste into the brush handle.When the the toothpaste is used up, you will realise that its to buy a new one.
The outermost of the handle is made of soft material, so the toothpaste can come out easily through extrusion. While the core of the handle is a hard stick. Thus, even though the toothpaste run out of, you can still hold the handle when brushing.