2 year warranty
Philips Sonicare DiamondClean 9900 PrestigeRechargeable Toothbrush - Trial Unit NOT FOR RESALE
HX9837/92
Available in
Experience a next-level clean
Experience Next-Generation Sonicare with the DiamondClean 9900 Prestige electric toothbrush and SenseIQ Adaptive Intensity, delivering real-time personalized guidance. Achieve 20x more plaque removal* for a gentle yet effective clean.
most used power toothbrush brand by dental professionals
with SenseIQ & smart coverage feedback
Experience a next-level clean
Smart coverage feedback
SenseIQ Adaptive Intensity
20x more plaque removal*
Up to 15x healthier gums**
Next-Gen Sonicare Technology
20x more plaque removal*, gentle on gums
Feel our best clean with the A3 All-in-One brush head. Remove 20x more plaque, enjoy up to 15x healthier gums in six weeks, and see 100% more stain removal in less than two days versus a manual toothbrush. Enjoy a gentle yet effective clean for your teeth and gums with 62,000 bristle movements per minute.
No missed areas with instant coverage feedback
The toothbrush closely follows your progress to help you clean thoroughly. The light ring at the base of the handle glows yellow when a segment of your mouth still needs attention. When it glows blue, the area is clean and you can move on to the next segment. Finished cleaning? A glance at the mouth map on the handle's display will show you any areas that need a touch-up.
Automatically adjusts based on your brushing behavior
SenseIQ Adaptive Intensity helps protect your teeth and gums by automatically adjusting to your brushing style. When Pressure + SenseIQ is activated, the toothbrush senses pressure, motion and coverage up to 100 times a second and reduces the intensity if you brush too hard.
Technical Specifications
Reviews
1.5
of 5
2
Reviews
Derpie
15/10/2026
US
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
pancake95
17/10/2026
US
Comically huge downgrade
This is such a massive downgrade from the old model that it's hard to comprehend. 1. The travel case—previously best in industry—is now effectively useless. Instead of USB C, it requires a proprietary cable which can't be stored in the case itself. 2. The charger requires a heavy GLASS cup which has a ROUNDED interior. You read that right: a) the brush *does not stand upright* while charging b) the glass cup is heavy, bulky, and separate from the base c) i cannot find any replacement charger/cup. so if you knock that cup off the counter, thast 400 dollars down the drain Oh and before you ask, the brush handle shape has changed, so neither your old charger nor your old travel case will work.
Pros
Touchscreen display
Cons
Proprietary charger for both travel case and home. Charger requires a large glass cup, and the interior is curved so the brush doesn't even stand upright.
This review was made for DiamondClean 9900 Prestige HX9834/92 Rechargeable Toothbrush
Date of Use 2026-10-16
This review was made for DiamondClean 9900 Prestige HX9834/92 Rechargeable Toothbrush
Date of Use 2026-10-16
vs. a manual toothbrush.
in Clean mode vs. a manual toothbrush in 6 weeks.
in less than 2 days vs. a manual toothbrush.