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Philips Sonicare 4100 Power Toothbrush ($40, originally $50)

If you've been brushing with a manual, now's the perfect time to upgrade to an electric toothbrush. This model is Amazon's top-selling electric toothbrush with over 46,000 reviews and a 4.4-star rating. It removes up to seven times more plaque than a manual toothbrush and has a pressure sensor and a two-minute timer. At just below $40, it's also an incredible deal.