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Innovative automatic eco-brush, working from kinetic energy

Someone remains true to the classic toothbrush, but many prefer her an electric model that takes care of the cleanliness of teeth much better. However, it can be replaced by new automatic models called Be, which work without batteries and not mains.The principle of operation of the novelty is the same as that of electrical analogs: at a speed of 40,000 rpm, it takes 120 seconds,to perform hygiene ...