6 Answers

A toothbrush is not a simple machine, it does not work on the principle of levers, effort, and load.

It's not a machine at all in mathematical terms. A "machine" is that which performs "work", i.e. transfers or converts energy.

You arm moving the toothbrush is a machine by this definition, however.

http://wiki.answers.com/Q/What_kind_of_a_simple_machine_is_a_toothbrush

By now, you have flunked, or graduated, as it is 2 yrs. later...

country bumpkin

Cheesefingers barely brushed by. (*~*)

....simple, if hand driven, or is it effective ?

....the electric is not simple and is proven to be more effective 

....both are simple to use

If you're talking about an electric toothbrush, it is powered by a battery to make the brush spin around.

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