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Amazon [amazon.com] has 2-Count Oral-b Charcoal Whitening Therapy Toothbrush (Soft) for $ 2.80 when you ‘clip’ the $ 1 coupon on the product page and checkout via Subscribe & Save. Shipping is free.

You must be logged in to clip coupons; coupons are typically limited to one per account. You may cancel Subscribe & Save anytime after your order ships. Select the later date from the "First Delivery On" menu to get traditional S&S checkout instead of adding to your cart.