How a Crest Spin Brush Works. It is actually pretty simple. Battery powers the dc motor which spins the crank that pushes the piston up and down. The case is impossible to open without destroying it. The case was glued shut. The electric toothbrush lasted for about 1 1/2 years until it died on me.
I bet you money that female sex toy vibrators work the same way without the piston.
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