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Battery-free toothbrush is powered with a twist
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 disposables when they're done. There might be a better way soon, though: Goodwell Co. is crowdfunding Be, which it bills as the first battery-free powered toothbrush. Twist the base twice and a kinetic energy storage mechanism will vibrate the brush head for up to 2 minutes, or just long enough for that dentist-recommended cleaning. You don't have to connect to a charger, and you won't contribute to landfills by chucking out batteries (the bristles are even biodegradable).
Finally, an open-source smart toothbrush with a subscription plan
If you ever thought to yourself, "Self, I need a crowdfunded toothbrush that tracks my oral activities," you're in luck. The folks at Goodwell estimate that we'll each go through some 300 toothbrushes over the course of our lifetime. As such, it wants to do its part to wage a war against the "planned obsolescence" of traditional fang-cleaning apparatus. For just $69, you get a hollow aluminum handle with a compostable, replaceable, charcoal brush head -- even with a $79 subscription for replacement parts that's still cheaper than Oral B's SmartSeries. If you're feeling even more spendy though, you can get what's known as the premium kit, which comes with screw-on flosser and tongue-scraper accessories, costing $89.
