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06
d
Days
22
h
Hours
40
m
Minutes
46
s
Seconds
HX9911/79
HX991K
Available in
Complete care for your oral health
Enjoy complete oral care with the Philips Sonicare DiamondClean Electric Toothbrush - for up to 100% more stain removal**. Its app-connected technology tracks your brushing habits, helping you care for your oral health.

Recommended sonic toothbrush brand by dental professionals worldwide
10 x more plaque removal*
Up to 100% more stain removal **
Pressure sensor
4 modes and 3 intensities
Slim, compact travel case + 4 x C3 brush heads
Deep cleaning needs a special approach and this C3 brush head uses a cluster of dense, stiff bristles at its centre in a pentagonal shape to whiten and polish your teeth, for up to 100% more stain removal in three days. It also removes up to 10 x more plaque than a manual toothbrush.
Philips Sonicare toothbrushes clean gently yet effectively and care for your teeth and gums with 62,000 bristle movements per minute. Sonicare Fluid Action supports the bristles to clean by driving fluid deep between teeth and along the gumline.
It's easy to brush too hard, so this Philips Sonicare toothbrush has a smart optic sensor to detect excessive pressure. If you're brushing too hard, it will let you know trough gentle vibrations as a reminder to ease off the pressure to help your gums stay protected.
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4.2
of 5
996
Reviews
84%
recommend this product
PPOUK
24/10/2026
United Kingdom
Verified buyer
It really helps
It really helps to reduce tartar buildup on my teeth. Just follow the instructions.
Yes, I recommend this product
This review was made for DiamondClean 9000 Series HX9911/88 Special edition sonic electric toothbrush
Date of Use 2026-10-23
Yes, I recommend this product
This review was made for DiamondClean 9000 Series HX9911/88 Special edition sonic electric toothbrush
Date of Use 2026-10-23
Fully toothed pensioner!
15/10/2026
United Kingdom
Verified buyer
The sweet spot a for Diamond Clean toothbrush
The best value Diamond Clean, providing satisfactory features without breaking the bank. With 3 selectable brushing intensities and four modes, Clean, White, Gum Health and Deep Clean you have lots of choice for brushing. There is also a blue-tooth smartphone app which provides advice on how well you have brushed your teeth; in truth I have only used this feature a couple of times as I find it a bit gimmicky. I always use Boots to purchase my Philips toothbrush, and look out for the the 'over sixty' store days, when pensioners with an advantage card can get 20% off when spending over £40. When you couple this with additional in store discount offers and advantage points, you can grab an absolute grade 'A' bargain. As an added incentive from Philips, If you register your product quickly (within 30 days of purchase) you can get an an additional one year guarantee, providing 3 years of cover should anything go wrong.
Pros
Excellent cleaning with great features (4 modes and 3 intensities). Up to three years guarantee if you register the product.
Cons
Replacement brush heads can be expensive, but Costco do special offers from time to time, bringing the cost to
Yes, I recommend this product
This review was made for DiamondClean 9000 Series HX9911/88 Special edition sonic electric toothbrush
Date of Use 2025-03-01
Yes, I recommend this product
This review was made for DiamondClean 9000 Series HX9911/88 Special edition sonic electric toothbrush
Date of Use 2025-03-01
John74
23/09/2026
United Kingdom
Verified buyer
The Best One
Had several Sonicare products, all have performed very well. Consistently reliable.
Pros
Easy to hold even when wet.
Cons
Brush heads can be expensive.
Yes, I recommend this product
This review was made for DiamondClean 9000 Series HX9911/84 Special edition sonic electric toothbrush
Date of Use 2026-08-10
Yes, I recommend this product
This review was made for DiamondClean 9000 Series HX9911/84 Special edition sonic electric toothbrush
Date of Use 2026-08-10
We guarantee quality for lasting peace of mind
We give products a second chance with refurbishment
We help you replace parts instead of products
We take responsibility for our impact
vs. a manual toothbrush.
in White+ mode using a leading whitening toothpaste in 3 days.
as compared to a DiamondClean brush head