#854: Twistiff

Toothbrushes, whether electrical or mechanical, come in different stiffnesses (although dentists seem to disapprove of anything which is firmer than cotton wool).

Today’s invention is a mechanism whereby a standard toothbrush can benefit from some variation in the stiffness of its bristles.


As shown, when the wing nut on the back is twisted, the yellow plate is drawn downwards, making the brush more flexible.

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