Battery-powered toothbrushes are convenient if you don't like brushing your teeth the old-fashioned way, but they have a catch: batteries. Typically, you either need to dock your brush (and remember to carry a charger with you on long trips) or toss...from Engadget RSS Feed https://www.engadget.com/2017/10/31/be-powered-battery-free-toothbrush/
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