This invention from Kawamura Ganjavian makes perfect sense: it’s a
toothbrush with a toothpaste reservoir right in the handle. When you’re
going on a trip, you pre-load the reservoir with the appropriate number
of toothpaste servings. Then, simply twist the handle to squeeze some
paste onto the bristles and get to brushing. Of course, you could also
use the Twist & Brush when you aren’t on the road. The design is so
simple and intuitive it’s hard to believe no one has thought of it
before.
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