Philips Sonicare DiamondClean 9900 Prestige Review (2025)
I’ve always believed that oral healthcare products shouldn’t be expensive or overly complicated. A great toothbrush should be easy to use, effective, and feel like a genuine upgrade to your daily routine. The Philips Sonicare DiamondClean 9900 Prestige is one of the best electric toothbrushes I’ve ever used.
It’s a premium option that won’t suit every budget, but if cost isn’t a concern and you’re simply looking for the best brush available, this is the one to beat.
It’s also beautifully designed and would make a brilliant gift for someone who values both performance and style.
This article contains affiliate links; however, all the opinions are my genuine thoughts after trialling the toothbrush for four months at home and when travelling - Dr Zaeem Jafri BDS
In Summary
The Philips Sonicare DiamondClean 9900 Prestige is the most powerful sonic toothbrush currently on the market. Philips has a long-standing reputation in electric oral care, and this model builds on that legacy with impressive performance and smart features. It connects to an app to track your brushing habits and includes both pressure and motion sensors to ensure you’re not pressing too hard or scrubbing incorrectly.
Design-wise, it’s sleek and modern. The minimalist aesthetic, hidden secondary buttons, and soft matte finish make it feel genuinely premium in hand. It also comes with a compact travel case that neatly fits both the brush and head, with USB-C charging built in — perfect for travelling without bulky stands or extra cables.
There are a few downsides to note. Battery life sits at around 14 days, which falls short of the 40 days offered by newer brushes like SURI and Ordo. Longevity can also be a concern — while I haven’t had mine long enough to confirm, some users report battery or motor issues after the two-year warranty period.
At around £200, it’s certainly not cheap. But if budget isn’t a deciding factor and you want the best-performing, most luxurious electric toothbrush available, this is the one.
★★★★★
Pros
Great premium design, feels and looks great
High powered action 62,000 strokes per minute
2-minute timer with haptic feedback
Pressure and Scrubbing Sensor
Will clinically clean your teeth enough to prevent diseases and decay
USB-C charging with the sleek travel case
Connects seamlessly via bluetooth to an app to track brushing habits
2-year limited warranty
Cons
Short battery life - 14 days on a single charge
No focus on sustainability
No money-back guarantee
Expensive replacement brush heads
Design and Ergonomics
The Philips Sonicare DiamondClean 9900 Prestige follows the tried-and-tested Philips design but elevates it with a refined, premium finish. The matte coating feels soft and grippy in hand, and the brush itself has a reassuring weight that adds to its high-end feel. It’s available in three colours, all of which look far more stylish than the standard glossy white you find on most brushes.
Black
Midnight blue
Champagne
The interface is beautifully clean. The main power button sits flush, while a secondary button for changing modes is hidden below it, keeping the look sleek and uncluttered. In truth, most people will stick to one brushing mode, so the minimalist approach works well.
The indicator lights and display are cleverly integrated — when they’re off, they blend seamlessly into the handle, giving the illusion they don’t exist. A simple touch or movement activates them, which feels both modern and intuitive.
Hidden buttons and displays
If you’ve got space, the charging stand is one of the best-looking on the market, matching the brush’s overall premium aesthetic. Personally, though, I prefer using the compact travel case, which doubles as a USB-C charger to charge mine whenever I need to.
Overall, the design and ergonomics are exceptional — it’s a toothbrush that feels as good as it looks.
Cleaning Performance
As the flagship model in the Philips Sonicare range, the Philips Sonicare DiamondClean 9900 Prestige is the most powerful sonic toothbrush I’ve tested to date. Delivering up to 62,000 brush movements per minute, it leaves your teeth feeling exceptionally clean and polished after every use.
As I mention in all my toothbrush reviews, any modern electric toothbrush will be effective enough to maintain good oral health when used correctly. The difference with the Philips Sonicare DiamondClean 9900 Prestige is how refined the clean feels. It’s particularly good at lifting surface stains and giving that smooth, fresh finish you notice when you run your tongue across your teeth.
With higher power, there’s always a risk of irritation or sensitivity, but the multiple brushing modes make it easy to find one that suits your comfort level. Whether you prefer a gentler daily clean or a more intensive polish, you can tailor the experience to your needs.
It’s worth noting that there’s no scientific evidence to prove that one electric toothbrush cleans better than another. What we do know is that electric brushes as a whole are far more effective than manual ones.
Key Features
The Philips Sonicare DiamondClean 9900 Prestige is packed with advanced features designed to optimise your brushing routine and make oral care effortless:
62,000 strokes per minute – Delivers powerful sonic cleaning for a smooth, polished finish every time.
15 brushing combinations – A mix of 3 intensity levels and 5 preset modes (including Clean, White+, Gum Health, Deep Clean, and Sensitive). In reality, most people will stick with the default Clean mode for everyday use.
BrushPacer – Splits your mouth into six zones and prompts you every 20 seconds to move to the next area, ensuring even coverage.
Smartimer – Automatically stops the brush at the end of your session, helping you maintain the recommended brushing time without needing to watch the clock.
Bluetooth-connected app – Tracks your brushing time and habits, syncing automatically with Apple Health.
Guided brushing mode – Provides real-time feedback via the app to help you learn the ideal pace and coverage as you brush.
SenseIQ technology – Features smart sensors that detect if you’re applying too much pressure or scrubbing, alerting you with gentle light indicators.
Brush head replacement reminder – A built-in light reminds you when it’s time to replace the brush head for optimal performance.
Purple warning light means you are brushing too hard
Together, these features make the Philips Sonicare DiamondClean 9900 Prestige one of the most intelligent and user-friendly electric toothbrushes available.
Philips Sonicare App
One of the standout features of the Philips Sonicare DiamondClean 9900 Prestige is its integration with the Philips Sonicare app, available for both Android and iPhone.
Connecting the brush is incredibly straightforward. After downloading the app, I simply held the Philips Sonicare DiamondClean 9900 Prestige near my phone — it detected and paired automatically within seconds.
Since then, every brushing session has synced seamlessly, with no connectivity issues so far, which is impressive given how temperamental Bluetooth can sometimes be.
Within the app, you can:
Adjust your brushing time and intensity
Switch between modes
Check battery levels
Review detailed brushing reports
The app tracks:
Total brushing time
Missed areas, helping you improve coverage
Pressure, including where you’re brushing too hard
Scrubbing, identifying when and where you’re moving the brush incorrectly
These insights are genuinely useful. After just a few uses, you’ll start noticing patterns and learn where you might need to adjust your technique.
The app also connects with Apple Health, though it only syncs basic data like brushing duration — not the more advanced pressure or scrubbing feedback.
There’s also a guided brushing mode. When you run the app alongside your session, it walks you through each area of your mouth in real time, telling you where to focus and for how long.
Overall, the app integration is excellent. Even if you don’t plan to use it daily, spending a few sessions with it can give valuable feedback and help refine your brushing technique — especially for adults who may not realise where they’re missing or overbrushing.
Travel-Friendly Features
The Philips Sonicare DiamondClean 9900 Prestige comes with one of the most stylish travel cases on the market. The case has a premium leather-like finish and includes USB-C charging, which is a huge advantage when travelling. You don’t need to bring any extra cables or charging stands, simply use your existing laptop or phone charger to power it up.
Battery life sits at around 14 days, which is shorter than many modern brushes. However, with USB-C charging built into the case, this is rarely an issue as it’s easy to top up whenever needed.
The case design is also smartly thought out. The brush head detaches and stores neatly inside, allowing the case to remain compact and easy to pack. It’s shorter than most other toothbrush cases, which makes it ideal for fitting into hand luggage.
The only downside is that the fit inside the case isn’t completely snug. The Philips Sonicare DiamondClean 9900 Prestige can rattle slightly when closed, and there’s a small risk it might shift if not positioned carefully. It’s not a major flaw, but at this price point, you’d expect the finish to feel a touch more secure.
Sustainability
If sustainability is an important factor in your buying decision, the Philips Sonicare DiamondClean 9900 Prestige may not be the best choice. While Philips as a company makes broad claims about corporate responsibility and reducing environmental impact, there’s very little specific information available about this particular model.
Philips states that the Philips Sonicare DiamondClean 9900 Prestige is made with 70% recyclable plastic, but beyond that, there’s no clear detail on how they’re actively reducing waste, improving recyclability, or minimising the environmental footprint of the product. Much of what’s published feels like general corporate sustainability messaging rather than tangible, product-level action.
By comparison, brands like SURI are more transparent about their sustainability efforts — using plant-based plastics, offering recycling schemes for brush heads, and designing products that aim to reduce oral care waste overall. They’re not perfect, but they’re clearly making visible steps in the right direction.
SURI 2.0 and Philips Sonicare DiamondClean 9900 Prestige
The Philips Sonicare DiamondClean 9900 Prestige also doesn’t appear to be repairable, though to be fair, even brands that advertise repairability often end up replacing units rather than fixing them.
In short, it’s difficult to assess the true environmental impact of this toothbrush. If sustainability is a top priority for you, it’s worth exploring alternatives from companies that are more open and proactive about their eco-friendly practices.
Price / Money-back Guarentee
When it comes to Philips and Oral-B, it’s best to ignore the recommended retail price. These brushes are almost never sold at full RRP.
The Philips Sonicare DiamondClean 9900 Prestige typically sells for around £199 on Amazon, though certain colour options can reach £299. You’ll often find even better deals during Amazon Prime Day or seasonal sales.
While Philips lists the brush at around £550 on its own website, that figure isn’t realistic. There’s no reason to purchase it directly from Philips when trusted third-party retailers consistently offer it for far less.
Replacement brush heads are priced at around £12 each, or roughly £8.50 per head if you buy a pack of six, which helps reduce the running cost slightly.
The Philips Sonicare DiamondClean 9900 Prestige includes a two-year limited warranty, but unlike some modern brands, there’s no money-back guarantee period.
This means you can’t trial it risk-free before committing, so it’s worth being sure this is the right brush for you before buying.
Final Thoughts
Overall, we absolutely love the Philips Sonicare DiamondClean 9900 Prestige. It’s a truly premium toothbrush that delivers an exceptional clean and comes packed with features designed to support healthy brushing habits. The combination of power, design, and smart functionality makes it stand out as one of the most advanced brushes on the market.
The Bluetooth connectivity and app integration work smoothly, adding an extra layer of insight for anyone who enjoys tracking their routine or wants guided feedback to improve their technique.
It’s certainly not for everyone — the high price will be a deal-breaker for some — but if you’re willing to invest and want the very best electric toothbrush available, the Philips Sonicare DiamondClean 9900 Prestige is hard to beat.
Other Recommended Articles
The best electric toothbrushes in the UK 2025
How to use an electric toothbrush properly
SURI 2.0 electric toothbrush review
What do you think?
If you’ve got a Philips Sonicare DiamondClean 9900 Prestige, we would love to know what you think of it. Have you enjoyed using it, have you had any problems?
Disagree with something in our review?
Let us know in the comments below!
