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
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.
See all benefits
Sonic electric toothbrush + 2 accessories and app
total
recurring payment
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.
The Philips Sonicare app lets you know when you've achieved a thorough clean and coaches you to be a better, more mindful brusher.
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.
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.
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.
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.
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.
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.
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.
Connectivity
Power
Technical specifications
Design and finishing
Service
Compatibility
Ease of use
Items included
Cleaning performance
Modes
BrushSync Mode Pairing
Smart sensor technology
Software Support
Looking for additional accessories? Show Parts & Accessories
Philips Sonicare
Charging glass
CP1722/01
Philips Sonicare
Charging travel case
CP0557/01
We guarantee quality for lasting peace of mind
We give products a second chance with refurbishment*
We help you replace parts instead of products*
We take responsibility for our impact
* Applicable only for Personal Care, Mother&Child Care and Household products
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United Kingdom (English)
