The toothpaste tube is placed in the holder and by pressing the toothbrush against a button under it, a portion of toothpaste is applied directly on the toothbrush.
Model: ZGT Automatic Lazy Toothpaste Dispenser
outlets such as newchic.com (last checked April 2020)
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There are a variety of toothpaste dispenser models that have the same function.
This tip is from 2015