1. Introduction
The Philips Sonicare DiamondClean Smart 9300 electric toothbrush is designed to provide advanced oral care. This manual provides essential information for setting up, operating, maintaining, and troubleshooting your device to ensure optimal performance and longevity.

Image: Philips Sonicare DiamondClean Smart 9300 Electric Power Toothbrush in black, shown with its charging glass, a travel case, and a smartphone displaying the Sonicare app interface.
2. What's in the Box
- Philips Sonicare DiamondClean Smart 9300 Handle (Black)
- Brush Head(s) (specific types may vary)
- Charging Glass
- Travel Case
- USB Charging Cable (for travel case)
- User Manual (this document)

Image: The Philips Sonicare DiamondClean Smart 9300 electric toothbrush, two additional brush heads, the charging glass, and the premium travel case, illustrating the complete package contents.
3. Setup
- Charge the Handle: Place the toothbrush handle into the charging glass. Connect the charging glass to a power outlet. The battery indicator lights will illuminate to show charging progress. Allow 24 hours for a full initial charge.
- Attach a Brush Head: Align the brush head with the metal shaft on the handle and push it down firmly until it clicks into place.
- Download the Sonicare App (Optional): For personalized coaching and real-time feedback, download the Philips Sonicare app from your device's app store and follow the on-screen instructions to pair your toothbrush via Bluetooth.

Image: A close-up view of the black Philips Sonicare DiamondClean Smart 9300 handle with a brush head securely attached, ready for use.
4. Operating Instructions
The DiamondClean Smart 9300 offers multiple modes and intensity settings for a customized brushing experience.
Brushing Modes:
- Clean: For daily superior cleaning.
- White+: For removing surface stains.
- Gum Health: Gently cleans gums and improves gum health.
- Deep Clean+: For an invigorating deep clean.
The toothbrush features smart brush head mode pairing technology, automatically selecting the optimal mode and intensity level for the attached brush head.
Intensity Settings:
Choose from 3 intensity settings (low, medium, high) to suit your comfort level. Press the intensity button to cycle through the options.
Pressure Sensor:
A visual pressure sensor alerts you if you are brushing too hard, helping to protect your teeth and gums from excessive pressure.

Image: A hand demonstrating the controls on the Philips Sonicare DiamondClean Smart 9300 handle, highlighting the power button and mode/intensity selection buttons.
Using the Sonicare App:
Connect your toothbrush to the Sonicare app for real-time feedback on your brushing technique, including coverage, scrubbing, and pressure. The app provides personalized coaching to help you improve your oral hygiene habits.
Video: An official Philips Sonicare video demonstrating the features of the DiamondClean Smart toothbrush, including its smart sensors and app connectivity for personalized brushing guidance.
5. Maintenance
Brush Head Replacement:
Replace your brush head every 3 months, or sooner if the bristles are splayed or worn. The toothbrush may provide a customized reminder for replacement.
Cleaning:
- After each use, rinse the brush head and bristles thoroughly.
- Wipe the handle with a damp cloth.
- Clean the charging glass and travel case as needed.
6. Troubleshooting
- Toothbrush not turning on: Ensure the battery is charged. Place the handle in the charging glass for at least 24 hours.
- Reduced brushing power: The brush head may be worn. Replace the brush head. Ensure the brush head is securely attached.
- Pressure sensor constantly activating: You may be applying too much pressure. Adjust your brushing technique to a lighter touch.
- App connectivity issues: Ensure Bluetooth is enabled on your smartphone and the toothbrush is within range. Restart both the app and the toothbrush if issues persist.
7. Specifications
| Model Number | HX9903/11 |
| Product Dimensions | 4.37 x 6.85 x 9.92 inches |
| Item Weight | 1 Kilograms (2.2 Pounds) |
| Power Source | Battery Powered (1 A battery included) |
| Operation Mode | Electric |
| Number of Settings | 4 Brushing Modes, 3 Intensity Levels |
| Special Features | Pressure Sensor, Smart Brush Head Mode Pairing, App Connectivity |
| Handle Material | Plastic |
| Bristle Material | Nylon |
| Color | Old Black |
8. Warranty and Support
For warranty information and customer support, please refer to the official Philips Sonicare website or contact their customer service directly. Keep your proof of purchase for any warranty claims.
Manufacturer: Philips Sonicare
Date First Available: March 26, 2017
For further assistance, visit the Philips Sonicare Store.







