Philips Sonicare DiamondClean 9400 Smart, Electric Toothbrush, Black, HX9917/89


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Whiter, healthier teeth for life. Remove up to 100% more stains*** with Philips Sonicare’s best whitening in our most elegant sonic electric toothbrush.

Enjoy a stylish and user-friendly design, Simple to charge and style to boot. DiamondClean users experience improved oral health. 

Removes up to 20x more plaque* for a deep clean. Up to 15x healthier gums**


DiamondClean users experience improved oral health with the All-in-One brush head for complete care. Up to 7x heathier gums**** in just 2 weeks

Let the DiamondClean 9400 adapt to your needs for a personalised brushing experience with multiple mode options and intensities. Stay on track with a personalized progress report in the app.

The DiamondClean 9400 guides you to improve and maintain healthy brushing habits, with built-in smart sensors to detect too much pressure

With multiple brush heads included, our BrushSync technology automatically selects the best mode for you depending on the brush head you choose and reminds you when it’s time for a new one

Beautiful and portable with a 2-week battery life and USB charging travel case


*vs a manual toothbrush
**vs a manual toothbrush in 6 weeks
***in lab test vs a manual toothbrush
**** based on two period of two-minute brushings per day on standard mode
Philips Sonicare is the No1 dental professional recommended sonic toothbrush brand worldwide


Philips Sonicare is the No1 dental professional recommended sonic toothbrush brand worldwide.
T3 2020 Award Winner for Best Electric Toothbrush

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