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Paulo Trutaleft a comment
Cool idea but this is not novel. Phillips does this with a whole product line of toothbrushes: https://www.amazon.com/Philips-S... All that while managing to be price competitive and including a carry case that also doubles as a charger, so you can leave your original (glass cup charger) in your bathroom.
Mode ToothbrushThe first electric toothbrush that charges without wires