Philips Sonicare DiamondClean Smart 9300 (HX9903/65) Electric Toothbrush with App

What it is and why people buy it

The Philips Sonicare DiamondClean Smart 9300 is an advanced sonic electric toothbrush built around guidance, not just vibration. It combines four brushing modes and three intensity levels with features designed to help you brush more gently and more consistently. On paper, that matters because the biggest day-to-day difference for many people isn’t “is it sonic?”—it’s whether they can maintain the right pressure and follow a routine.

You also get app support: connect the toothbrush to the Philips Sonicare app to receive personalized brushing guidance aimed at improving habits over time. If you like seeing feedback (instead of guessing whether you brushed well), this is the kind of setup that can feel worth it.

What stands out in everyday use

Two details make this model feel more “smart” than a basic sonic brush.

First, there’s a pressure sensor. If you press too hard, the light ring at the end of the handle will blink to remind you to ease up. That’s useful because many people tend to automatically increase pressure when they feel like they’re not doing enough. It’s not perfect—some users may still need a few tries to adjust their technique—but the reminder is right there while you brush.

Second, the app-connected approach is meant to steer you. The toothbrush provides guidance through the Philips Sonicare app so you can keep improving your brushing habits. If you’ve ever struggled to stay consistent, the “track and adjust” style of coaching can help you stay on track rather than returning to old routines.

Brushing modes and intensity: enough control, not too much fuss

This toothbrush offers 4 brushing modes and 3 intensity levels. In practice, that’s a good balance: you can pick a mode for different needs (as described by its modes) and dial in intensity based on comfort.

If you tend to go “all in” and then get soreness, the ability to choose an intensity level can help you find a comfortable setting. And if you have a specific goal—like focusing on a certain routine—having multiple modes lets you customize without turning brushing into a complicated workflow.

Key points to know before you buy

Here’s what you should take seriously before deciding.

The product description includes claims about plaque removal, gum health, and stain reduction compared with a manual toothbrush, and it references professional recommendations. Still, results vary by person and technique. The pressure sensor and app guidance are meant to support better technique, but the brush can’t fully fix inconsistent habits on its own.

Also, this is a “smart” toothbrush experience. If you strongly prefer a standalone device with no app involvement, you may not use the app features much, and the added complexity could feel unnecessary.

Who it’s for (and who should skip it)

It makes sense if you want a sonic electric toothbrush that actively helps you brush better: the pressure feedback is immediate, and the app guidance is there to support improvement over time.

It might not be the best match if you’re looking for a simple, minimal toothbrush experience or if you don’t want to connect a device to an app. In that case, you may be happier with a more straightforward sonic model where the value is mostly in the brushing itself.

A quick example of use

Say you’re brushing after work and you notice you usually “scrub” a bit too hard. With this model, the light ring blinking if you apply too much pressure gives you an instant cue. You back off slightly, keep the motion gentle, and continue through your chosen mode. Over days or weeks, the app guidance is intended to help reinforce that routine—so your technique improves even on busy mornings.

Is it worth it?

Buying the Philips Sonicare DiamondClean Smart 9300 (HX9903/65) is worth considering if you value coaching: pressure feedback during brushing plus personalized guidance through the Philips Sonicare app. The mix of 4 modes, 3 intensity levels, and brush head detection (as described) is a practical way to tailor your routine while reducing the risk of brushing too aggressively.

You may want to skip it if you don’t plan to use the app features or you prefer a basic sonic toothbrush with fewer “smart” elements. In that scenario, you’d likely be paying for guidance you won’t take advantage of.

If you’re the type who benefits from real-time reminders and habit support, this sits in a more feature-forward category within electric sonic brushes—and it aligns well with people who want help getting consistent, gentle brushing results.