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    Philips Sonicare DiamondClean Smart Sonic electric toothbrush + 2 accessories and app

    HX9917/89

    Up to 20 x more plaque removal even in hard-to-reach areas

    The DiamondClean Smart 9400 is our best toothbrush, for complete care. Four high-performance brush heads let you focus on all areas of your oral health and our Smart Sensor technology gives you personalised feedback and coaching.

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    DiamondClean Smart
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    DiamondClean Smart

    Sonic electric toothbrush + 2 accessories and app

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    Up to 20 x more plaque removal even in hard-to-reach areas

    Complete care for a healthier mouth

    • Up to 20x more plaque removal
    • Up to 7 x healthier gums
    • 4 modes and 3 intensities + vibrating lightring as pressure sensor
    • USB charging travel case + Charging glass
    • Personalised guidance from the Philips Sonicare app
    Choose from 4 modes and 3 intensity settings

    Choose from 4 modes and 3 intensity settings

    With DiamondClean Smart you get the full works. Our 3 intensity settings let you boost your clean and our 4 modes cover all your brushing needs; Clean mode for exceptional daily cleaning, White+ to remove stains, Deep Clean+ for an invigorating deep clean, and Gum Health to gently clean along your gum line.

    Guides your brushing and highlights missed areas

    Guides your brushing and highlights missed areas

    The Philips Sonicare app lets you know when you've achieved a thorough clean and coaches you to be a better, more mindful brusher.

    Takes you back to any missed spots for 100% coverage

    Takes you back to any missed spots for 100% coverage

    If you happen to miss a spot while brushing your teeth, your app's TouchUp feature will show you. You can then go back for a second pass, and be confident you are getting a complete clean, every time.

    Make sure you're getting the most from your brush head

    Make sure you're getting the most from your brush head

    Brush heads wear out over time and become less effective at removing plaque. With smart brush head recognition you'll never lose track of when to replace your brush head. Your toothbrush tracks how long and hard you've brushed with each brush head, and will alert you when it's time to replace. You can also monitor the lifetime of your brush heads in the Philips Sonicare app, and even order replacements so you're never caught short.

    Start taking better care of your trouble areas

    Start taking better care of your trouble areas

    Any trouble areas your dentist has pointed out? We'll highlight them on your in-app 3D mouth map and remind you to pay extra attention to these areas.

    Alerts you if you're pressing too hard

    Alerts you if you're pressing too hard

    You might not notice when you brush too hard, but your DiamondClean Smart will. If you use too much pressure, the light ring on the end of your handle will flash. This is a gentle reminder to ease off the pressure and let your brush head do the work. 7 out of 10 people found that this feature helped them to become a better brusher.

    Guides you to reduce your scrubbing

    Guides you to reduce your scrubbing

    With an electric toothbrush, you let the brush do the work. We've built a scrubbing sensor into your handle as a gentle reminder to reduce scrubbing. This way, you can improve your technique and get a gentler, more effective clean.

    Brush heads automatically select the optimal settings

    Brush heads automatically select the optimal settings

    Wondering which mode and intensity you should use? Wonder no longer. A microchip in your brush head tells your DiamondClean Smart which one you're using. So if you click on a gum-care brush head, for example, your toothbrush knows to select the optimal mode and intensity to provide gentle yet effective care for your gums. All you need to do is to press the power button.

    Easy and stylish charging — home and away

    Easy and stylish charging — home and away

    You'll enjoy two weeks of regular use from a single full charge. However, if you run low while travelling, your deluxe USB travel case doubles as a charger. Place your toothbrush in the case and either connect it to your laptop or a wall socket. As for charging at home, simply place your brush in your sleek charger glass—it fits stylishly into your bathroom and also doubles as a rinsing glass.

    Technical Specifications

    • Connectivity

      Bluetooth® wireless technology
      Connected brushing app
    • Power

      Voltage
      110-220 V
    • Technical specifications

      Operating time (full to empty)
      14 days***
      Battery
      Rechargeable
      Battery type
      Lithium ION
    • Design and finishing

      Colour
      Black
    • Service

      Warranty
      2-year limited warranty
    • Compatibility

      Android compatibility
      Android OS 8.0 or above
      iOS compatibility
      iPhones on iOS 13.0 or above
    • Ease of use

      Handle compatibility
      Easy click-on brush heads
      Handle
      Slim ergonomic design
      Battery indicator
      Illuminated icon indicates battery life
      Brush head recognition
      Syncs with optimal mode
      Replacement reminder
      • To always ensure best results
      • reminder icon lights up
    • Items included

      Travel case
      USB charging travel case
      Brush heads
      • 1 All-in-1 Premium Brush Head
      • 1 G3 Premium Gum Care
      Handle
      1 DiamondClean Smart
      Glass charger
      1
    • Cleaning performance

      Speed
      Up to 62,000 brush movements/min
      Performance
      Removes up to 20 x more plaque*
      Timer
      BrushPacer and SmarTimer
      Pressure feedback
      • Ring lights up in purple
      • Vibrates handle to alert user
      TouchUp
      Ensures 100% coverage
    • Modes

      Clean
      For exceptional everyday cleaning
      3 intensities
      • Low
      • Medium
      • High
      Deep Clean+
      For an invigorating deep clean
      Gum Health
      For a gentle yet effective clean for gums
      White+
      To remove surface stains
    • BrushSync Mode Pairing

      G3 Premium Gum Care brush head
      Pairs with Gum Health mode
      All-in-One Premium
      Pairs with clean mode
    • Smart sensor technology

      Pressure sensor
      Alerts when brushing too hard
      Location sensor
      Tracks and improves coverage
      Scrubbing sensor
      Guides to reduce scrubbing
      3D mouth map
      Highlights trouble areas
      TouchUp
      To address missed spots
    • Software Support

      Software updates
      Philips offers relevant software updates for a period of 2 years after the date of purchase.

    What's in the box?

    Other items in the box

    • Sonicare handle Diamond Clean Smart 9400
    • Premium All-in-One brush head
    • Premium Gum Care Brush Head (G3)
    • Glass charger
    • USB-C Charging Travel Case

    Looking for additional accessories? Show Parts & Accessories

    Parts and Accessories

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    Reviews

    • Removes up to 10 x more plaque vs a manual toothbrush
    • *compared to DiamondClean
    • **based on brushing for two minutes twice a day on standard mode

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