What does SenseIQ actually do?

It senses pressure, motion and coverage up to 100 times per second and adjusts intensity automatically, so you get feedback without watching the app.

Do I need the app to use it?

No, but several features and mode changes are app-only, so you lose some control without it.

How does it compare with other Sonicare brushes?

It is the most advanced Sonicare, adding sensing and app tracking to the same sonic action. Cheaper models clean well but lack the automatic adjustment.

What brush head does it use?

It comes with the All-in-One A3 head with multi-angle bristles, and it takes Sonicare's compatible heads.

Is it worth it over a mid-range Sonicare?

If you want automatic pressure and coverage feedback and will use the app, yes. If you just want a solid sonic clean, a mid-range model does that for less.

The brush handle, an All-in-One A3 brush head and a travel case.

Philips Sonicare DiamondClean Prestige 9900 Rechargeable Electric Toothbrush with SenseIQ, Midnight HX9990/12

Q: Where is the Philips Sonicare DiamondClean Prestige 9900 Rechargeable Electric Toothbrush with SenseIQ, Midnight HX9990/12 cheapest?

At eBay, for $230.00, 30% under what the other stores charge, as of our latest check.

Q: What do buyers say about the Philips Sonicare DiamondClean Prestige 9900 Rechargeable Electric Toothbrush with SenseIQ, Midnight HX9990/12?

Rated 4.2 out of 5 from 495 ratings. Buyers like: Teeth feel dentist-office clean; Battery stays strong after 4+ years; App syncs and tracks brushing routine, pressure and coverage. Common complaints: Splatter makes a mess in and around the sink; Toothpaste slung across the room by the bristle power.

Q: Where can I buy the Philips Sonicare DiamondClean Prestige 9900 Rechargeable Electric Toothbrush with SenseIQ, Midnight HX9990/12?

15 stores we checked sell it, including Amazon, Philips, eBay, Best Buy, Kohl's.

Best price now

$230.00at eBayChecked 1 h ago

30% under what the other stores charge

Compared across 15 stores. Prices are checked against each store and labelled with when. Store links may earn us a commission.

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What reviewers say

4.2 / 5495 ratings

Owners rate it highly for cleaning results, long battery life and app feedback, but many complain about splatter and about features locked to the app.

What people mention

Cleaning powerPraisedOwners say their teeth feel dentist-office clean after brushing.
SplatterCriticisedReviewers complain that toothpaste splatters in and around the sink and even across the room.
App featuresMixedThe app tracks routine, pressure and coverage well, but some features and mode changes work only through it.
BatteryPraisedBuyers report the battery stays strong after four or more years.
Build qualityPraisedOwners describe a sturdy brush with seamless buttons and a good travel case.
ValueCriticisedSome buyers consider it expensive.

About the Philips Sonicare DiamondClean Prestige 9900 Rechargeable Electric Toothbrush with SenseIQ, Midnight HX9990/12

The Philips Sonicare DiamondClean Prestige 9900 is a rechargeable electric toothbrush that uses sonic technology. Its SenseIQ technology senses pressure, motion and coverage up to 100 times per second and automatically adjusts intensity.

It comes with an All-in-One A3 brush head with multi-angle bristles. The brush delivers 62,000 bristle movements per minute with Sonicare Fluid Action.

Philips states that it removes up to 20x more plaque than a manual toothbrush. It also states up to 15x healthier gums in six weeks and up to 100% more stain removal in less than two days.

Type

Electric toothbrush

Technology

Sonic, with SenseIQ

Bristles

Medium

Brush head

All-in-One A3 with multi-angle bristles

Movement

62,000 bristle movements per minute

Sensing

Pressure, motion and coverage, up to 100 times per second

Power

Rechargeable

Color

Midnight

Model

HX9990/12

What buyers say

Buyers like

Teeth feel dentist-office clean
Battery stays strong after 4+ years
App syncs and tracks brushing routine, pressure and coverage
Instant feedback on brushing speed and pressure
Sturdy build with seamless buttons and a good travel case
Auto shut-off after 2 minutes

Buyers complain about

Splatter makes a mess in and around the sink
Toothpaste slung across the room by the bristle power
Some features work only through the app
Changing modes is app-only
Considered expensive

Philips Sonicare DiamondClean Prestige 9900 Rechargeable Electric Toothbrush with SenseIQ, Midnight HX9990/12

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Philips Sonicare DiamondClean Prestige 9900 Rechargeable Electric Toothbrush with SenseIQ, Midnight HX9990/12

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