---
product_id: 373536247
title: "Philips Sonicare DiamondClean Smart 9400 Electric Toothbrush, Sonic Toothbrush with App, Pressure Sensor, Brush Head Detection, 4 Brushing Modes and 3 Intensity Levels, Black, Model HX9917/89"
brand: "philips"
price: "$559.21"
currency: USD
in_stock: true
reviews_count: 8
category: "Philips"
url: https://www.desertcart.us/products/373536247-philips-sonicare-diamondclean-smart-9400-electric-toothbrush-sonic-toothbrush-app
store_origin: US
region: United States of America
---

# 62,000 bristle movements/min App-connected personalized coaching 2-week battery life per charge Philips Sonicare DiamondClean Smart 9400 Electric Toothbrush, Sonic Toothbrush with App, Pressure Sensor, Brush Head Detection, 4 Brushing Modes and 3 Intensity Levels, Black, Model HX9917/89

**Brand:** philips
**Price:** $559.21
**Availability:** ✅ In Stock

## Summary

> 🦷 Elevate your smile game with smart sonic precision!

## Quick Answers

- **What is this?** Philips Sonicare DiamondClean Smart 9400 Electric Toothbrush, Sonic Toothbrush with App, Pressure Sensor, Brush Head Detection, 4 Brushing Modes and 3 Intensity Levels, Black, Model HX9917/89 by philips
- **How much does it cost?** $559.21 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/373536247-philips-sonicare-diamondclean-smart-9400-electric-toothbrush-sonic-toothbrush-app)

## Best For

- philips enthusiasts

## Why This Product

- Trusted philips brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Connected Oral Care:** Sync with the Philips Sonicare app for personalized feedback and brushing insights that elevate your routine.
- • **Travel-Ready Luxury:** Charge anywhere with the sleek USB travel case and iconic charging glass—premium care on the go.
- • **Precision Sonic Power:** Experience up to 20x more plaque removal with 62,000 sonic movements per minute for a dentist-level clean every day.
- • **Smart Pressure Sensor:** Protect your gums with real-time alerts that flash when you brush too hard—because gentle care wins.
- • **Tailored Brushing Modes:** Customize your routine with 4 modes and 3 intensity levels to match your unique oral health goals.

## Overview

The Philips Sonicare DiamondClean Smart 9400 is a cutting-edge electric toothbrush delivering up to 20x more plaque removal and 15x healthier gums versus manual brushing. Featuring 62,000 sonic movements per minute, 4 customizable modes, 3 intensity levels, and a pressure sensor, it offers personalized, dentist-recommended care. The toothbrush connects to an app for real-time coaching and includes a premium travel case with USB charging and a stylish charging glass. With up to two weeks of battery life, it’s designed for professionals who demand effective, smart, and convenient oral hygiene.

## Description

Product Description The Philips Sonicare DiamondClean Smart 9400 electric toothbrush provides complete and efficient oral care, removing up to 20 x more plaque than a manual toothbrush and providing up to 15 x healthier gums². It's safe to use with braces, fillings, crowns and veneers. There are 4 brushing modes: Clean mode for daily cleaning, White+ for stain removal, Gum Health for gentle but effective cleaning of the gums and Deep Clean+ for a refreshing, thorough clean. There are also 3 intensity levels to choose from. The built-in Philips Sonicare light ring pressure sensor lets you know if you're pressing too hard. The Advanced Sonic Technology provides gentle yet effective cleaning, pulsing fluid between teeth and along the gumline with a cleaning power of 62,000 bristle movements per minute. The innovative BrushSync™ technology will let you know when it's time to change your brush head. Improve your brushing technique with QuadPacer and reach your recommended brushing time of 2 minutes with SmarTimer. The Philips Sonicare DiamondClean Smart 9400 works perfectly as a travel toothbrush thanks to the premium travel case with an integrated USB. You can also top up the power at home with the iconic charging glass. With regular use, the battery will last up to two weeks on a single charge (based on two periods of two-minute brushings per day on standard mode). ¹ vs. a manual toothbrush ² in Clean mode vs. a manual toothbrush ³ based on a study of over 2600 dental professionals (dentists and hygienists) conducted in the United States, Canada, Japan, China, Korea, Thailand, Germany, the United Kingdom, Switzerland, France, Belgium, Austria, Italy, Spain, Sweden in 2022-2023 ⁴ after 3 days of use in White+ Mode vs a manual toothbrush using a leading whitening toothpaste.Packaging may vary. Directions 1. Use one of the four high-performance brush heads to focus on all areas of your oral health. 2. Follow the Smart Sensor technology for personalized feedback and coaching. 3. Ensure 100% coverage with the TouchUp feature. 4. Brush for the recommended duration using the BrushPacer and SmarTimer. 5. Replace the brush head every 3 months as indicated by the reminder icon. P.when('A').execute(function(A) { A.on('a:expander:toggle_description:toggle:collapse', function(data) { window.scroll(0, data.expander.$expander[0].offsetTop-100); }); }); Safety Warning Keep out of reach of children under 3 years old. Use only for oral hygiene. Legal Disclaimer Philips offers relevant software updates for a period of 2 years after the date of purchase See more

Review: very powerful, reasonably quiet - i was hesitant to go for this brush after years of using oral B and the first few brushes did feel odd, but now I'm past that this is an excellent choice, i needed a good electric brush that was not only transportable in a case but also rechargeable via USB power bank and this fitted the bill perfectly, it feels well made and isn't too noisy, there is a built in 2 min timer function, it has several cleaning functions and 3 levels of intensity, the vibrations are very strong and it cleans your teeth well, i like the supplied glass that means this won't topple over in the bathroom like others do, and the glass is also used alongside the charging puck, you also get 1 years' worth of brush heads supplied so no other immediate outlay. the APP is there if you're that way inclined and it keeps track of your progress, but it has to be open and with you which i did a few times but not since as it's a bit gimmicky in my opinion, all in all as a good powerful toothbrush that has multiple modes and power levels it is very much recommended
Review: Excellent Brushing, very good customer service for a repair - Excellent toothbrush with superb cleaning. My brush on/off button was failing. I was offered the repair 😊 Good customer service, the brush was picked up by Royal Mail t the doorstep and returned in around 10 days. Very pleased to have it back, it was replaced by a new brush handle.

## Features

- Advanced sonic toothbrush for improved oral health: with the same brushing, it's up to 20 x more effective¹ and provides up to 15 x healthier gums²
- Personalise your brushing with this innovative electric toothbrush for adults: choose from 4 brushing modes and 3 intensity levels to meet your oral healthcare goals
- Real-time feedback: the light ring on the end of your handle will flash if you use too much pressure, so you can ease off the pressure and protect your teeth and gums
- Personalised guidance: connect your toothbrush to the Philips Sonicare app and receive personalised brushing guidance to maintain and improve your brushing habits
- #1 dental professional-recommended sonic toothbrush brand worldwide³: benefit from Philips expertise to keep your teeth and gums in the best condition
- The set includes: 1 x DiamondClean Smart 9400 sonic electric toothbrush, 1 x A3 Premium All-in-One brush head, 1 x G3 Premium Gum Care brush head, 1 x charging glass, 1 x USB charging travel case
- Contains UK 2-Pin bathroom plug for use in bathrooms. Packaging may vary.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09BW5SJBD |
| ASIN  | B09BW5SJBD |
| Age Range Description | Adult |
| Batteries  | 1 Lithium Ion batteries required. (included) |
| Best Sellers Rank | 7,161 in Health & Personal Care ( See Top 100 in Health & Personal Care ) 28 in Sonic Toothbrushes |
| Brand | Philips |
| Country of origin | China |
| Country of origin  | China |
| Customer Reviews | 4.3 4.3 out of 5 stars (338) |
| Customer reviews | 4.3 4.3 out of 5 stars (338) |
| Date First Available | 22 Oct. 2021 |
| Delivery information | We cannot deliver certain products outside mainland UK ( Details ). We will only be able to confirm if this product can be delivered to your chosen address when you enter your delivery address at checkout. |
| Item model number  | HX9917/89 |
| Manufacturer  | Philips |
| Package Dimensions  | 25.6 x 17.6 x 11.4 cm; 840 g |
| Units | 1.0 count |

## Product Details

- **Age range (description):** Adult
- **Brand:** Philips
- **Colour:** Black
- **Item firmness description:** Medium
- **Material feature:** Sustainable
- **Number of items:** 1
- **Power source:** Battery Powered
- **Special feature:** Brushing Timer
- **Toothbrush Head Shape:** Diamond Shaped
- **Unit count:** 1.0 count

## Images

![Philips Sonicare DiamondClean Smart 9400 Electric Toothbrush, Sonic Toothbrush with App, Pressure Sensor, Brush Head Detection, 4 Brushing Modes and 3 Intensity Levels, Black, Model HX9917/89 - Image 1](https://m.media-amazon.com/images/I/816BgP-mBcL.jpg)
![Philips Sonicare DiamondClean Smart 9400 Electric Toothbrush, Sonic Toothbrush with App, Pressure Sensor, Brush Head Detection, 4 Brushing Modes and 3 Intensity Levels, Black, Model HX9917/89 - Image 2](https://m.media-amazon.com/images/I/7195ZNcGOsL.jpg)
![Philips Sonicare DiamondClean Smart 9400 Electric Toothbrush, Sonic Toothbrush with App, Pressure Sensor, Brush Head Detection, 4 Brushing Modes and 3 Intensity Levels, Black, Model HX9917/89 - Image 3](https://m.media-amazon.com/images/I/71EyXwXfsVL.jpg)
![Philips Sonicare DiamondClean Smart 9400 Electric Toothbrush, Sonic Toothbrush with App, Pressure Sensor, Brush Head Detection, 4 Brushing Modes and 3 Intensity Levels, Black, Model HX9917/89 - Image 4](https://m.media-amazon.com/images/I/71s-vOXekVL.jpg)
![Philips Sonicare DiamondClean Smart 9400 Electric Toothbrush, Sonic Toothbrush with App, Pressure Sensor, Brush Head Detection, 4 Brushing Modes and 3 Intensity Levels, Black, Model HX9917/89 - Image 5](https://m.media-amazon.com/images/I/71OGOTw5ByL.jpg)

## Available Options

This product comes in different **Style** options.

## Questions & Answers

**Q: Is there an instant Feedback with this model where there is a sensor to locate the location of the brush in the mouth?**
A: Yes

**Q: Does it have a sensitive setting?**
A: Yes

**Q: Does it come with a warranty?**
A: How LONG is the warranty-is it 12 months or less? Please state clearly ?

**Q: Can two people, each with downloaded Sonicare app of their own, connect to the same 9400 brush**
A: Yes

## Customer Reviews

### ⭐⭐⭐⭐⭐ very powerful, reasonably quiet
*by A***Y on 19 July 2025*

i was hesitant to go for this brush after years of using oral B and the first few brushes did feel odd, but now I'm past that this is an excellent choice, i needed a good electric brush that was not only transportable in a case but also rechargeable via USB power bank and this fitted the bill perfectly, it feels well made and isn't too noisy, there is a built in 2 min timer function, it has several cleaning functions and 3 levels of intensity, the vibrations are very strong and it cleans your teeth well, i like the supplied glass that means this won't topple over in the bathroom like others do, and the glass is also used alongside the charging puck, you also get 1 years' worth of brush heads supplied so no other immediate outlay. the APP is there if you're that way inclined and it keeps track of your progress, but it has to be open and with you which i did a few times but not since as it's a bit gimmicky in my opinion, all in all as a good powerful toothbrush that has multiple modes and power levels it is very much recommended

### ⭐⭐⭐⭐⭐ Excellent Brushing, very good customer service for a repair
*by J***. on 1 November 2025*

Excellent toothbrush with superb cleaning. My brush on/off button was failing. I was offered the repair 😊 Good customer service, the brush was picked up by Royal Mail t the doorstep and returned in around 10 days. Very pleased to have it back, it was replaced by a new brush handle.

### ⭐⭐⭐⭐ Great Toothbrush
*by J***E on 12 December 2025*

I haven’t experienced any issues with the product itself so far; it has functioned as expected. However, the shipping box arrived noticeably damaged, with tears and dents visible, although this apparent damage did not seem to impact the integrity of the product. Since purchasing, I have only used it four times, so I cannot comment on its long-term durabilit.

## Frequently Bought Together

- Philips Sonicare DiamondClean Smart 9400 Electric Toothbrush, Sonic Toothbrush with App, Pressure Sensor, Brush Head Detection, 4 Brushing Modes and 3 Intensity Levels, Black, Model HX9917/89
- Philips Sonicare Original A3 Premium All-in-One Standard Sonic Toothbrush heads - 2 Pack in Black (Model HX9092/11)
- Philips Sonicare Original C3 Premium Plaque Defence Standard Sonic Toothbrush Heads - 4 Pack in Black (Model HX9044/33) (Packing May Vary)

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.us/products/373536247-philips-sonicare-diamondclean-smart-9400-electric-toothbrush-sonic-toothbrush-app](https://www.desertcart.us/products/373536247-philips-sonicare-diamondclean-smart-9400-electric-toothbrush-sonic-toothbrush-app)

---

*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-03-08*