Philips Sonicare DiamondClean Smart 9300 review

The Philips Sonicare DiamondClean Smart 9300 is a premium electric toothbrush designed to reduce staining and plaque, but how well does it do either?

Philips Sonicare DiamondClean Smart 9300 review
(Image: © Philips)

Top Ten Reviews Verdict

The Philips Sonicare DiamondClean Smart is a Bluetooth electric toothbrush that gives you real-time feedback on your brushing habits to help you take better care of your teeth and gums. It has a noticeable effect on light staining too, but the Deep Clean mode is simply to intense for sensitive teeth and gums.


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    Built-in pressure sensors

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    Real-time brushing feedback


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    Deep Clean mode is intense

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You can't move these days for smart electric toothbrushes, and the Philips Sonicare DiamondClean Smart 9300 is leading the pack. It features many of the features found on our top picks for the best electric toothbrushes, including real-time coaching feedback to help you brush your teeth more effectively. 

The toothbrush is also designed to chip away at plaque build-up, and to reduce enamel staining. This could be a real ally if you're an avid tea or coffee drinker, though we'd still recommend using one of the best teeth whiteners to brighten your smile more effectively. 

There are a lot of features and cleaning modes on offer with the Philips Sonicare DiamondClean Smart 9300, but are they suitable for your oral hygiene needs? Here we look at the toothbrush in terms of design, features, performance and pricing, and to see if it could help you better protect your teeth and gums in between visits to the dentist. If you're looking for dental coverage too, take a look at our guide to the best dental insurance

Philips Sonicare DiamondClean Smart 9300 review: Design and features

The toothbrush handle has a slim, ergonomic design with sophisticated LED lighting. As it interacts with its high-tech, microchipped brush heads, the handle automatically adjusts its mode and intensity to the corresponding settings. The toothbrush also tracks your brush head usage and prompts you when it’s time for replacements. You can order them right through the app.

Like Oral-B’s leading toothbrush, the Oral-B Genius Pro 8000, the Philips Sonicare DiamondClean Smart 9300 comes with a smart travel case so you can charge your toothbrush and phone simultaneously. 

When you’re not on the road, you simply place the handle in its charging glass to keep its lithium-ion battery powered, and the charging glass doubles as a rinsing glass. 

A full charge gives you 14 days of operating time, and the toothbrush’s battery indicator light flashes white until the handle is ready. Although one of our testers thought the charging glass might be hard to keep clean, its overall look is impressive.

Philips Sonicare DiamondClean Smart 9300 review

(Image credit: Philips)

Philips Sonicare DiamondClean Smart 9300 review: Performance

When we compared Sonicare’s app with Oral-B’s, we found Sonicare’s to be more intuitive. We liked the DiamondClean app’s interactive TouchUp feature, and we found its Smart Location Sensor more useful than Oral-B’s Position Detection. 

We also liked the DiamondClean’s BrushPacer. It helps you track your brushing through six zones in your mouth, and the toothbrush’s accompanying pressure sensor helps you maintain proper technique. 

If you press too hard or use a potentially damaging scrubbing motion, a light ring on the end of the handle flashes, and the handle itself vibrates, creating a multi-sensory reminder to brush gently.

Philips Sonicare DiamondClean Smart 9300 review

(Image credit: Philips)

To assist you further, the DiamondClean Smart comes with three brush heads and a tongue brush. Its Plaque Control brush head has soft, flexible sides that contour to the shape of your teeth, and its Gum Care brush head is designed to reduce inflammation. 

The Premium White brush head works on tough stains, and the TongueCare+ cleaning head helps freshen your breath. With four cleaning modes and three brushing intensities, the DiamondClean Smart has more setting than even the Philips Sonicare FlexCare Platinum Connected to help personalize your brushing experience.

Should I buy the Philips Sonicare DiamondClean Smart 9300?

The price of the Philips Sonicare DiamondClean Smart 9300 is a little off-putting at first, but compared to the price of today's real top-end Bluetooth electric toothbrushes, it's actually fairly reasonable. Especially when you consider the wealth of features on offer here, and how it helps to reduce staining and plaque. 

It's simple to use and lasts for a decent length of time per full battery charge, and has various cleaning modes to ensure you get the at-home care you need. The Deep Clean mode is far too intense for sensitive teeth and gums, and the motor is noisy in use, but otherwise this is a solid electric toothbrush that should last you years.

Jennifer Christensen

Jennifer Christensen has written for many newspapers and magazines and has broadcast experience in television and radio. She has earned journalism awards from the Utah Press Association and the Society of Professional Journalists and enjoys being a writer for Top Ten Reviews. Jennifer has five amazing children and loves to hike, play the piano, kick a soccer ball and eat ice cream.