1. Safety Information
For your safety and to ensure proper operation, please read and adhere to the following guidelines:
- Do not immerse the device in water for prolonged periods or at high temperatures.
- Use only approved chargers and keep the device out of reach of children.
- Keep the charging port tightly closed with its cover when in use.
- Charge the device with the Type-C USB charging cord specified as 5V 1A standard, included in the original packaging.
2. Package Contents
Verify that all items are present in your MySmile LP221 package:
- MySmile LP221 Cordless Water Flosser Unit
- 8 Jet Tips (including Standard, Dental Plaque, Orthodontic, Periodontal, and Tongue Cleaner tips)
- Type-C USB Charging Cable
- Storage Pouch
- Instruction Manual

Image: MySmile LP221 Water Flosser unit, various jet tips, charging cable, and storage pouch.
3. Product Overview
The MySmile LP221 is a UVC sterilizable cordless water flosser designed for comprehensive oral hygiene. It features an OLED display, customizable pressure settings, and a large water reservoir for extended use.

Image: Detailed internal view of the MySmile LP221 Water Flosser highlighting its pump, battery, and UVC light components.
4. Setup
4.1 Charging the Device
Before first use, fully charge the water flosser. The 1800 mAh battery provides up to 40 days of use on the lowest mode after a full charge.
- Locate the Type-C charging port on the device, usually covered by a protective flap.
- Open the flap and connect the provided Type-C USB charging cable.
- Connect the other end of the cable to a 5V 1A power adapter, computer, power bank, or car adapter.
- The OLED display will indicate the battery charging status.
4.2 Attaching a Jet Tip
- Select the desired jet tip for your oral care needs.
- Insert the tip into the opening at the top of the flosser unit until it clicks securely into place.
- To remove a tip, press the release button located on the back of the flosser unit and pull the tip out.
4.3 Filling the Water Tank
The MySmile LP221 features a 335ml enlarged water reservoir, reducing the need for frequent refills during use.
- Twist the bottom part of the flosser unit to detach the water tank.
- Fill the tank with warm water. Warm water is often recommended for comfort, especially for sensitive teeth.
- Reattach the water tank to the main unit by twisting it until it is securely fastened.

Image: The MySmile LP221 Water Flosser showcasing its large 335ml water reservoir, designed for fewer refills.
5. Operating Modes and Pressure Settings
The MySmile LP221 offers 4 cleaning modes and 3 pressure levels (excluding pulse mode), allowing for 10 customizable water flossing patterns.
- Soft Mode (40-80 PSI): Ideal for sensitive teeth, new users, and children above 8 years old.
- Normal Mode (80-120 PSI): Suitable for daily cleaning for most users.
- Strong Mode (120-150 PSI): Designed for deep cleaning and removing hard-to-reach stains.
- Pulse Mode (40-120 PSI): Provides gum massage and is beneficial for individuals with mild periodontitis.
Use the 'M' button to cycle through the modes and the '+' / '-' buttons to adjust pressure levels within each mode. The OLED display will clearly show the selected mode, pressure level, battery power, and water temperature.

Image: The OLED display of the MySmile LP221 Water Flosser, illustrating the Soft, Normal, Strong, and Pulse modes with their respective pressure ranges.
6. Usage Instructions
Follow these steps for effective water flossing:
- Fill the 335 ml water tank with warm water.
- Attach the desired tip to the top of the unit.
- Press the power button to turn on the device.
- Adjust the mode and pressure to your preference using the 'M', '+', and '-' buttons.
- Lean over the sink and place the tip between your teeth, directing the water flow at a 90-degree angle to your gum line.
- Move the tip along your gum line and between your teeth, pausing briefly between each tooth.
- When finished, turn off the device and remove the tip for cleaning and storage.
7. UVC Sterilization
The MySmile LP221 incorporates a UVC sterilizer to ensure hygienic oral care.
- The UVC light sanitizer provides a 120-second sterilization process.
- This process eradicates up to 99.99% of bacteria, ensuring the water tank and jet tips are unpolluted for your next use.
- To activate UVC sterilization, hold the 'M' button down when the device is off, then press the '+' button. The device will run a 120-second UVC cycle.

Image: Illustration of the UVC light sterilizing the water tank and jet tip within the MySmile LP221 Water Flosser.
8. Maintenance and Cleaning
- The device is IPX7 waterproof, allowing for safe use in the shower.
- After each use, empty any remaining water from the reservoir.
- Clean the jet tips and the reservoir regularly. The UVC sterilization feature can be used for this purpose.
- A filter designed at the end of the gravity-ball sucker helps prevent clogging and reduces machine damage. Ensure this filter is kept clean.
9. Troubleshooting
If you encounter any issues with your MySmile LP221 Water Flosser, please refer to the following common solutions:
- Device not turning on: Ensure the device is fully charged.
- Weak water pressure: Check if the water tank is sufficiently filled. Ensure the selected mode and pressure level are appropriate. Clean the jet tip and the filter at the end of the gravity-ball sucker for any blockages.
- Water leakage: Ensure the water tank is securely attached and the charging port cover is properly sealed.
- UVC sterilization not activating: Ensure the device is off before attempting to activate the UVC cycle (hold 'M' then press '+').
For further assistance, please contact MySmile customer support.
10. Specifications
| Feature | Detail |
|---|---|
| Model Number | LP221 |
| Product Dimensions | 9.25 x 3.2 x 3.5 inches |
| Weight | 1.01 Pounds |
| Water Tank Capacity | 335 ML (11.33 Fl Oz) |
| Water Pulse Frequency | 2000-2800 times/min |
| Pressure Range | 40-150 PSI |
| Battery | 1800 mAh (1 CR5 battery included) |
| Battery Life | Up to 40 days (lowest mode) |
| Charging Input | 5V 1A (Type-C USB) |
| Waterproof Rating | IPX7 |
| Special Features | UVC Sterilization, OLED Display, Multiple Operation Modes, Multiple Pressure Settings, Battery Indicator |
11. Warranty and Support
For warranty information or technical support, please refer to the contact details provided in the product packaging or visit the official MySmile website. Ensure you retain your proof of purchase for any warranty claims.
12. Official Product Video
Video: An official product overview of the MySmile LP221 Water Flosser, demonstrating its features and benefits for daily oral hygiene.



