Sejoy C91
Sejoy Water Flosser User Manual
Model: C91 | Brand: Sejoy
Product Overview
The Sejoy Water Flosser is a rechargeable, cordless, and portable electric oral irrigator designed for effective teeth cleaning. It features 5 cleaning modes and comes with 8 jet tips, offering a comprehensive solution for daily oral hygiene, suitable for both home and travel use. Its IPX7 waterproof rating ensures safe use in wet environments.

Image: Sejoy Water Flosser, purple unit, with its packaging and various jet tips.
Key Features
- 8 Nozzles & 360° Rotation: Includes standard, tongue cleaner, periodontal, and orthodontic tips. The 360° rotatable nozzle allows for easy access to hard-to-reach areas.
- 5 Cleaning Modes: Soft (40psi), Gentle (60psi), Normal (100psi), Strong (120psi), and Pulse (40-120PSI speed switch) for varied cleaning needs and sensitivities.
- 230ML Detachable Water Tank & IPX7 Waterproof: Provides sufficient water for a single flossing session. Double-sealing rings prevent leakage, and the detachable tank allows for easy cleaning. Safe for use in the shower.
- Improved Gum Health & Brighter Teeth: Delivers 40-120PSI strong water pressure with upgraded pulsation technique, effectively removing 99.99% of food residue. Ideal for periodontitis and braces.
- 1800mAh Powerful Battery with USB Cable: Portable and rechargeable, offering up to 30 days of continuous use on a 4-hour charge. USB cable included for convenient charging.
Included in the Box
Your Sejoy Water Flosser package contains the following items:
- Sejoy Water Flosser Unit (Purple)
- 8 x Replacement Jet Tips (various types)
- USB Charging Cable
- Storage Bag
- User Manual

Image: All components included in the Sejoy Water Flosser package, laid out for display.
Setup
- Charge the Device: Before first use, fully charge the water flosser using the provided USB cable. The charging port is located at the bottom of the unit, covered by a protective cap. A full charge takes approximately 4 hours and can last up to 30 days depending on usage.
- Attach a Nozzle: Select the desired jet tip (e.g., standard, orthodontic). Insert the tip into the hole at the top of the flosser until it clicks into place. To remove, press the release button on the back of the unit and pull the tip out.
- Fill the Water Tank: Open the water tank cover located at the bottom of the unit. Fill the 230ml detachable water tank with lukewarm water. Close the cover securely to prevent leaks.

Image: Visual guide showing how to add water, attach/remove tips, and operate the device.
Operating Instructions
- Select Cleaning Mode: Press the 'Mode' button to cycle through the 5 available cleaning modes: Soft, Gentle, Normal, Strong, and Pulse. For first-time users or those with sensitive gums, start with 'Soft' mode.
- Position the Nozzle: Lean over a sink. Place the tip of the nozzle in your mouth, directing it towards your gum line at a 90-degree angle.
- Start Flossing: Press the 'Power' button to turn on the device. Guide the water stream along your gum line, pausing briefly between teeth. Ensure the device remains pointed into your mouth while operating to avoid splashing.
- Complete Flossing: Continue until you have cleaned all areas of your mouth. The 230ml tank is typically sufficient for one full flossing session. If needed, refill the tank and continue.

Image: A hand holding the Sejoy Water Flosser, demonstrating the 360-degree rotatable nozzle and ergonomic design.
Maintenance
- Empty and Clean Water Tank: After each use, empty any remaining water from the tank. The detachable design allows for thorough cleaning. It is recommended to leave the tank's plug open to allow it to air dry completely.
- Clean Nozzles: Rinse the jet tips under running water after each use. For optimal hygiene, it is recommended to replace the nozzles every 3 months.
- Wipe Down Unit: Wipe the exterior of the water flosser with a soft, damp cloth. Do not submerge the main unit in water beyond its IPX7 rating.
- Storage: Store the water flosser in a dry place away from direct sunlight when not in use.

Image: Close-up of the detachable 230ml water tank, highlighting its easy-to-clean design.
Troubleshooting
If you encounter any issues with your Sejoy Water Flosser, please refer to the following common solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No water flow or weak pressure | Low battery, empty water tank, clogged nozzle, or pump issue. | Ensure the unit is fully charged. Refill the water tank. Remove and clean the nozzle, or replace it if necessary. If the issue persists, contact customer support. |
| Unit does not turn on | Low battery or power button malfunction. | Charge the unit fully. Press the power button firmly. If still unresponsive, contact customer support. |
| Water leakage | Water tank cover not closed properly, or damaged sealing rings. | Ensure the water tank cover is securely closed. Check the sealing rings for any damage and replace if needed. |
Specifications
| Feature | Detail |
|---|---|
| Product Dimensions | 3.03 x 4.88 x 10.16 inches |
| Item Weight | 1.15 Pounds |
| Model Number | C91 |
| Water Tank Capacity | 230ml |
| Water Pressure Range | 40-120 PSI |
| Battery Capacity | 1800mAh |
| Charging Time | Approx. 4 hours |
| Usage Time (Full Charge) | Up to 30 days |
| Waterproof Rating | IPX7 |
| Power Source | Battery Powered |
| Wattage | 5 watts |
Safety Information
Please read all instructions carefully before using this product. Keep out of reach of children. Do not use if you have an open wound in your mouth or on your gums. Consult your dentist if you have any concerns about using a water flosser with specific dental conditions.
Statements regarding dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease or health condition.
Warranty and Support
For warranty information or technical support, please contact Sejoy customer service through the retailer where you purchased the product or visit the official Sejoy website. Please retain your proof of purchase for warranty claims.
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