Tumbler + toothpaste
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The design of the bobble-toothpaste tube is such that when it is held upside down, the toothpaste inside can fall freely, allowing you to use up everything without any waste. Of course, this inversion is different from turning your toothbrush cup upside down, because you can shake it while brushing your teeth; after all, it’s a tumbling toy, and such shaking can accelerate the free fall of toothpaste. (What a stupid design)
You can have some fun while brushing your teeth