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2 year warranty
Expert tips and inspiration

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2 year warranty

Expert tips and inspiration

No more guessing.

Name: Sonicare DiamondClean 9900 Prestige Rechargeable Toothbrush
Brand: Sonicare
SKU: HX9834/92
Rating: 2 (1 reviews)

Complete care is now 100% visible

NEW Next-Generation DiamondClean

most used power toothbrush brand by dental professionals

90-day money back guarantee

Sonicare DiamondClean interactive display cleaning modes

Personalize your care with the interactive display

Woman brushing with Sonicare DiamondClean electric toothbrush

Advanced Sonicare Technology for deep cleaning

Sonicare DiamondClean post-brushing feedback light ring

Real-time guidance to never miss a spot

No more guessing. Complete care is now 100% visible.

Achieve Your Best Clean

Never miss an area with smart coverage guidance

Master your routine with live coaching. The visual mouth map and light ring guide you to cover every zone. Clinically proven 1500% healthier gums** and whiter teeth in 1 day***. Includes Prestige travel case.

SenseIQ brushing senses and protects

SenseIQ Adaptive Intensity senses your unique brushing style. It automatically adjusts pressure and motion to provide the most protective, personalised and effective clean for teeth and gums.

For a clean that's gentle yet incredibly effective

2000% more effective plaque removal*, 1500% healthier gums** and whiter teeth in 1 day***.

Real-time guidance to never miss a spot

Get personalised guidance for the confidence of your best clean

Smart Coverage Feedback

Yellow means missed, blue means clean

Eliminate guesswork with visual coaching. The handle's light ring tracks your progress in real time, glowing yellow for areas needing attention and turning blue once you have achieved a complete clean.

Protect your gums with pressure feedback

The smart pressure sensor protects your gums in real time. The light ring glows green when pressure is perfect and turns purple to alert you if you press too hard, ensuring a gentle, effective clean.

Protect your teeth and gums with instant pressure feedback

Perfect Your Clean

The display maps exactly where to re-touch and fix pressure

Finished brushing? The smart display shows your coverage map instantly. It reveals exactly which spots you missed, so you can go back and re-touch them for a flawless, complete clean.

Elevate your brushing experience

From personalisation and real-time guidance through to the look, feel, accessories and app, every element of this next-generation toothbrush is designed around you

Keep brushing your best with the replacement reminder

Did you know that brush heads become less effective after three months? The brush head replacement reminder tracks how often and how hard you brush, and reminds you to replace your brush head once it's time for a new one.

Stay charged on the go

Your new Sonicare DiamondClean comes with a glass charger, premium finishing and an aesthetic design that elevate your brushing experience. For life on the go, the Prestige travel case also doubles as a charger.

Celebrate your wins with the Sonicare app

Elevate your brushing experience

The premium design elevates your daily brushing experience, while the slim handle and accessories make it easy to use at home and on the go.

Next-Generation Sonicare Technology

Next-Generation Sonicare Technology automatically adjusts motor power to maintain performance in hard-to-clean areas.

Next-Generation Sonicare Technology

Our most reliable and consistent brushing experience, delivering 62,000 bristle movements per minute for gentle yet effective cleaning in hard-to-reach areas.

Technical Specifications

Sonicare DiamondClean 9900 Prestige Rechargeable Toothbrush

Select your Philips Sonicare DiamondClean 9900

DiamondClean 9900 Prestige
Rechargeable Toothbrush
HX9834/92
- Smart coverage feedback
- SenseIQ Adaptive Intensity
- 20x more plaque removal*
- Up to 15x healthier gums**
- Next-Gen Sonicare Technology
DiamondClean 9900 Prestige
Rechargeable Toothbrush
HX9834/91
- Smart coverage feedback
- SenseIQ Adaptive Intensity
- 20x more plaque removal*
- Up to 15x healthier gums**
- Next-Gen Sonicare Technology
DiamondClean 9900 Prestige
Rechargeable Toothbrush
HX9834/95
- Smart coverage feedback
- SenseIQ Adaptive Intensity
- 20x more plaque removal*
- Up to 15x healthier gums**
- Next-Gen Sonicare Technology
DiamondClean 9900 Prestige
Rechargeable Toothbrush - Trial Unit NOT FOR RESALE
HX9837/92
- Smart coverage feedback
- SenseIQ Adaptive Intensity
- 20x more plaque removal*
- Up to 15x healthier gums**
- Next-Gen Sonicare Technology
DiamondClean 9900 Prestige
Rechargeable Toothbrush - Trial Unit NOT FOR RESALE
HX9837/95
- Smart coverage feedback
- SenseIQ Adaptive Intensity
- 20x more plaque removal*
- Up to 15x healthier gums**
- Next-Gen Sonicare Technology

Reviews

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Customer opinions in the form of product and star ratings are useful for all customers. They allow you to learn more about the product and help you make a purchase decision. Any customer who has purchased a product online or in store can submit a review

2.0

of 5

Review

Derpie

15/10/2026

Ridiculous choices being made.

In 2026 we are releasing toothbrushes with “smart features” and they have a USB-A to power adapter cable?! The previous model already supported USB-C! For almost 400 dollars this is unacceptable!

Pros

Fancy tech, nice screen

Cons

Terribly expensive, USB-A and weird power cable for case.

This review was made for DiamondClean 9900 Prestige HX9834/92 Rechargeable Toothbrush

Date of Use 2026-10-15

This review was made for DiamondClean 9900 Prestige HX9834/92 Rechargeable Toothbrush

Date of Use 2026-10-15