| 摘要 |
A toothbrush assembly (10) includes a canister (11) housing a spring biased piston (14), a cartridge (12) for storing dentifrice (toothpaste) releasably received in the canister (11), and a brush head (13) attached to a stem (19) that is connected to the cartridge (12). A passage (18) extends through the stem (19) and connects an aperture (20) in the head (13) with an interior of the cartridge (12). A normally closed valve (30) controls the flow of dentifrice through the passage (18) which dentifrice is pressured by the spring biased piston (14).
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