Philips Sonicare DiamondClean Smart 9400
Sonic electric toothbrush with app
- Up to 20 x more plaque removal*
- Up to 15 x healthier gums**
- Up to 100% less stains***
- Visible pressure alert
All-in-One brush head for complete care
Clean without compromise with the A3 Premium All-in-One brush head. Our all-time best has angled bristles to help remove up to 20x more plaque even in hard-to-reach areas*. Triangular tips work to remove up to 100% more stains in less than two days***. And longer bristles clean deep for gums that are up to 15x healthier in just two weeks**. All of that without ever switching brush heads. Did you know: brush heads become less effective after 3 months of use? Our BrushSync feature can remind you when it's almost time for a replacement.
Sonic brushing: the masterclass in effective cleaning
Brush away plaque with sonic technology – our benchmark in effective and gentle cleaning. While you brush, up to 62,000 bristle movements and dynamic fluid action help the bristles clean even hard-to-reach areas, leaving your mouth feeling exceptionally fresh and clean.
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 you and provides instant feedback as you brush
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.
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.
Helps you improve your brushing technique
With an electric toothbrush, it's best to let the brush do the work. We've built a sensor into the handle that works with our app to help you reduce excess scrubbing. This way, you can improve your technique and get a gentler, more effective clean.
Smart guidance for gentle care
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.
Automatically selects the best mode for you
You'll always get the best possible clean with our BrushSync mode-pairing feature. Smart brush heads ensure that you're using the right mode and intensity for the best possible clean by selecting the optimal brushing mode and intensity level in combination with 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.
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.
| Support Period | Philips will provide the necessary security updates until 31 December 2026. |
| Bluetooth® wireless technology | Connected brushing app |
| Voltage | 110-220 V |
| Operating time (full to empty) | 14 days***** |
| Battery | Rechargeable |
| Battery type | Lithium ION |
| Energy consumption | Standby without display <0.5 W |
| Colour | Black |
| Warranty | 2-year limited warranty |
| Android compatibility |
Android phones with Bluetooth 4.0 and above Search Sonicare on Google Play Store for detailed OS compatibility. |
| iOS compatibility |
iPhone with Bluetooth 4.0 and above Search Sonicare on App Store for detailed iOS compatibility. |
| Handle | Slim ergonomic design |
| Handle compatibility | Easy click-on brush heads |
| Display | Illuminated display |
| 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 |
| Brush heads | 4 A3 Premium All-in-One |
| Travel case | 1 USB charging case |
| Handle | 1 DiamondClean Smart |
| Glass charger | 1 |
| Performance | Removes up to 20 x more plaque* |
| Speed | Up to 62,000 brush movements/min |
| Health benefits | Up to 15 x healthier gums** |
| Timer | BrushPacer and SmarTimer |
| Whitening benefits | Up to 100% less stains*** |
| Pressure feedback |
Ring lights up in purple Vibrates handle to alert user |
| TouchUp | Ensures 100% coverage |
| 3 intensities |
High Medium Low |
| Clean | For exceptional everyday cleaning |
| Deep Clean+ | For an invigorating deep clean |
| Gum Health | Special attention to molars |
| White+ | To remove surface stains |
| A3 Premium All-in-One | Pairs with Clean mode |
| 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 |
| Position sensor | Guides to areas you missed |
