| 摘要 |
The handle (7) of the toothbrush (1) has a control knob (9) at the bottom. By turning this knob (9) a piston (8) inside the handle (7) is lifted and the desired quantity of toothpaste (5) pushed through an outlet (2) between the bristles (3). A membrane at the outlet (2) prevents water from entering the toothpaste duct (4).
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