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Philips Sonicare DiamondClean Smart 9700 Review 2026: Is the Smartest Toothbrush Worth It?
Most people brush their teeth the same way they did as children: quickly, unevenly, and with a lot of guessing. The toothbrush in your bathroom drawer does not tell you when you press too hard, which spots you missed, or whether you actually brushed for two full minutes. The Philips Sonicare DiamondClean Smart 9700 exists to end that guessing. It is Philips’ flagship smart toothbrush, and it watches how you brush, coaches you through an app, and warns you the moment you press too hard.
With five cleaning modes, three intensity levels, a pressure sensor, brush-head detection, and one of the biggest brush-head kits ever packed into a toothbrush box, the 9700 is built for people who want a genuinely better clean, not just a fancier gadget. It charges in a glass, travels in a USB case, and even includes a tongue brush. The question is whether all that intelligence is worth it, or whether a simpler Sonicare would do the same job.
This review covers how the 9700 cleans, what the app actually does, where it falls short, the mistakes buyers make, and whether it is the smartest toothbrush worth buying in 2026.
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Why Brushing Harder Was Never the Answer
Dentists have said it for years: pressing harder does not clean better, it damages gums. Yet almost everyone does it, because a manual brush gives no feedback at all. The 9700’s pressure sensor is its most useful feature precisely because it solves a real problem. When you press too hard, the handle vibrates to warn you, and the app shows exactly where you overdid it. For people with sensitive or receding gums, that single feature can matter more than any cleaning mode.
Key Features of the Sonicare DiamondClean Smart 9700
Five modes and three intensities for every mouth
Five cleaning modes cover daily cleaning, deep cleaning, gum care, whitening, and sensitive teeth, with three intensity levels to fine-tune the feel. Sensitive mouths can start gentle and build up, while everyone else can pick a mode for the morning rush and a deeper one at night.
App coaching that shows what you missed
The companion app tracks your brushing in real time and builds a 3D map of your mouth, highlighting the spots you consistently miss. Over weeks, that map is genuinely eye-opening: most people discover the same two or three neglected zones, and fixing them is the closest thing to a dental check-up between visits.
Pressure sensor and brush-head detection
The pressure sensor warns you when you scrub too hard, protecting gums from damage. Brush-head detection automatically recognizes which head you attached and selects the matching mode and intensity, so switching from a plaque head to a gum-care head needs no menu diving.
A brush-head kit that covers the whole family routine
The box includes an A3 Premium All-in-One head, three C3 Premium Plaque Control heads, two G3 Premium Gum Care heads, and a TongueCare+ tongue brush. That is enough to cover daily cleaning, gum care, and tongue cleaning for months without buying anything extra, and the heads are the genuine Sonicare replacements dentists trust.
Charging glass, stand, and a USB travel case
The toothbrush charges by sitting in an elegant charging glass on its stand, which looks far better on a bathroom counter than a plastic dock. The included USB travel case charges the brush on the go, so a weekend trip or a long holiday never means going back to a manual brush.
Philips Sonicare DiamondClean Smart 9700: Quick Specs
| Specification | Philips Sonicare DiamondClean Smart 9700 (Lunar Blue HX9957/71) |
|---|---|
| Cleaning modes | 5 modes |
| Intensity levels | 3 intensities |
| Smart features | App coaching, pressure sensor, brush-head detection |
| Brush heads included | A3 head, 3x C3 heads, 2x G3 heads, TongueCare+ tongue brush |
| Charging | Charging glass + stand; USB travel case |
| Power | Rechargeable battery |
| Colour | Lunar Blue |
| Model | HX9957/71 |
Who the Sonicare 9700 Is Really For
People with gum sensitivity: The pressure sensor and gum-care mode protect gums while still cleaning deeply. Anyone who wants feedback: The app map shows missed spots no mirror ever will. Households sharing one handle: Multiple head types and automatic detection make switching between users simple. Frequent travelers: The USB travel case keeps the smart routine going on the road.
Who Should Look Elsewhere
If you will never open the app, much of the 9700’s advantage disappears, and a simpler Sonicare cleans just as well. If you want the cheapest good electric toothbrush, this flagship is overkill. And if you dislike charging a toothbrush in a glass, the premium charging setup may feel like fuss rather than luxury.
Pros and Cons
Pros: Genuinely useful pressure sensor; app coaching that reveals missed spots; five modes and three intensities; huge included brush-head kit; brush-head detection; elegant charging glass and USB travel case; excellent daily cleaning performance.
Cons: Premium flagship positioning; best features need the app; replacement heads are a running cost; the glass charging setup needs counter space; overkill for anyone who just wants a simple brush.
Common Mistakes Buyers Make With Smart Toothbrushes
Mistake 1: Ignoring the pressure warnings. The sensor only helps if you ease off when it buzzes. Brushing through the warning defeats the whole point.
Mistake 2: Never opening the app after week one. The coaching map gets more useful over time, not less. Check it weekly and your missed spots shrink fast.
Mistake 3: Using one head for everything. The kit exists for a reason: plaque heads, gum-care heads, and the tongue brush each do a different job.
Mistake 4: Keeping old heads too long. Worn bristles clean worse and irritate gums. Replace heads on schedule, and let the app remind you.
Sonicare 9700 vs Oral-B iO vs a Basic Sonicare
Oral-B’s smart brushes offer a similar app-and-sensor approach with a round-head design some users prefer. A basic Sonicare delivers the same core sonic cleaning for much less, without coaching or detection. The Sonicare 9700 wins for buyers who want the full package: coaching, pressure protection, automatic head detection, and a complete kit in one box.
FAQ: Philips Sonicare DiamondClean Smart 9700
Does the app really improve brushing?
Yes, for most people. The mouth map shows the spots you habitually miss, and that awareness alone usually improves coverage within a couple of weeks.
What does the pressure sensor do?
It vibrates the handle to warn you when you press too hard, helping protect your gums from over-brushing damage.
How many brush heads come in the box?
Seven pieces in total: an A3 head, three C3 heads, two G3 heads, and a TongueCare+ tongue brush.
Can I travel with it?
Yes. The included USB travel case charges the brush, so you can keep your routine on trips.
Do I need the app to use it?
No. The brush works fully without the app, but coaching, the mouth map, and head reminders need it.
Final Verdict: Should You Buy the Sonicare DiamondClean Smart 9700?
Yes, if you want your toothbrush to actually teach you to brush better. The pressure sensor protects your gums, the app reveals your blind spots, and the kit means you start complete. It is a premium buy, but it is the rare smart product whose intelligence solves a real everyday problem.
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