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Philips Sonicare DiamondClean Smart 9400 Sonic electric toothbrush with app

HX9917/90

Feel confident, with 100% coverage

Removes up to 10 x more plaque* for a deep clean
Choose from 4 modes and 3 intensity settings
Guides your brushing and highlights missed areas
Takes you back to any missed spots for 100% coverage
Make sure you're getting the most from your brush head

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Philips Sonicare DiamondClean Smart 9400 Sonic electric toothbrush with app

Removes up to 10 x more plaque* for a deep clean

Click on the G3 Premium Plaque Control brush head to experience our deepest clean. With soft flexible sides, the bristles contour to the shape of each tooth's surface to provide 4 x more surface contact** and remove up to 10 x more plaque from hard-to-reach areas*.

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

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

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

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

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

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

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

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

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

Grey
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

Slim ergonomic design

Handle compatibility

Easy click-on brush heads

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 10 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 (A3)
Premium Gum Care Brush Head (G3)
Glass charger
USB-C Charging Travel Case

Looking for additional accessories? Show Parts & Accessories

Accessories

C3 Premium Plaque Control

Standard sonic toothbrush heads

HX9044/17
G3 Premium Gum Care

Standard sonic toothbrush heads

HX9054/17