Amazon has the Philips Sonicare DiamondClean Smart Electric Rechargeable Toothbrush (9300 Series, White) for $139.95 shipped. Simply clip the $30 on-page coupon. Regular $200 or so, this is the best price we have tracked on this particular model and the lowest we can find. In fact, you’ll also find deep coupon deals on the black and pink variants as well. Rated 4+ stars from hundreds. 

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Philips DiamondClean Smart Electric Toothbrush:

Get the ultimate clean with DiamondClean Smart. Eliminate guesswork with real time feedback and personalized coaching for superior teeth, gum, whitening & fresh breath. It’s more than just a toothbrush – it’s a complete oral care solution.

  • Philips Sonicare’s best ever toothbrush for the most exceptional clean and complete care
  • Removes up to 10x more plaque and improves gum health up to 7x in just 2 weeks (in gum health mode vs. a manual toothbrush)
  • Removes up to 100% more stains in just 3 days (in white+ mode vs. a manual toothbrush)
  • 3 different smart brush head types automatically pair with the appropriate brushing mode and smart sensors provide real time feedback
  • 4 modes: Clean, White+, Deep Clean+ and Gum Health & 3 intensity levels

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