ADA Accepted
Professional Clean. Live Freely.

Professional Clean, Beyond the Countertop
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Live Freely

Professional care that moves with your life.
Marie Curie
Daily Mom
Digital Trends
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Verywell Health
Glossy
Tom's Guide
DentistryIQ
Perio-Implant Advisory
Marie Curie
Daily Mom
Digital Trends
E
Verywell Health
Glossy
Tom's Guide
DentistryIQ
Perio-Implant Advisory
Marie Curie
Daily Mom
Digital Trends
E
Verywell Health
Glossy
Tom's Guide
DentistryIQ
Perio-Implant Advisory
Marie Curie
Daily Mom
Digital Trends
E
Verywell Health
Glossy
Tom's Guide
DentistryIQ
Perio-Implant Advisory
Marie Curie
Daily Mom
Digital Trends
E
Verywell Health
Glossy
Tom's Guide
DentistryIQ
Perio-Implant Advisory
Marie Curie
Daily Mom
Digital Trends
E
Verywell Health
Glossy
Tom's Guide
DentistryIQ
Perio-Implant Advisory
Marie Curie
Daily Mom
Digital Trends
E
Verywell Health
Glossy
Tom's Guide
DentistryIQ
Perio-Implant Advisory

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Built on Proof. Trusted in Everyday Life.

Professional care is more than a promise—it is something we have spent years building and validating. With Since 2022 of focused research and development, 14 granted patents (invention & design) and 77 patent filings, and four ADA Accepted water flossers, COSLUS brings professionally validated oral care and clinic-level oral health protection into everyday routines. Today, COSLUS is trusted by more than 10 million users across the U.S. [ Data source: Internal data, updated August 15, 2026. ]

90.4%

Gum Bleeding Index Improvement

75.7%

Gumline Plaque Index Improvement

15 Days

To Healthier Gums

*Results are based on different clinical studies and testing conditions. Individual results may vary.

Professional Clean. Your Way. 
Shop E40 Learn More
COSLUS E40 10-Level Dial Pressure Control Cordless Water Flosser
COSLUS E40 water flosser in black color
COSLUS E40 10-Level Dial Pressure Control Cordless Water Flosser
COSLUS E40 10-Level Dial Pressure Control Cordless Water Flosser
COSLUS E40 10-Level Dial Pressure Control Cordless Water Flosser
COSLUS E40 10-Level Dial Pressure Control Cordless Water Flosser
COSLUS E40 10-Level Dial Pressure Control Cordless Water Flosser
COSLUS E40 10-Level Dial Pressure Control Cordless Water Flosser
COSLUS E40 10-Level Dial Pressure Control Cordless Water Flosser
COSLUS E40 10-Level Dial Pressure Control Cordless Water Flosser
COSLUS E40 10-Level Dial Pressure Control Cordless Water Flosser
COSLUS E40 10-Level Dial Pressure Control Cordless Water Flosser
COSLUS E40 10-Level Dial Pressure Control Cordless Water Flosser
COSLUS E40 10-Level Dial Pressure Control Cordless Water Flosser

COSLUS

COSLUS E40 10-Level Dial Pressure Control Cordless Water Flosser

4.8
$39.99 USD
$99.99 USD
Save $60.00 USD
Color: Black
View full Details

Compare Water Flossers

Compare key features and find the COSLUS water flosser that fits your routine.

Show differences only
COSLUS E40
COSLUS C20
COSLUS C31
COSLUS T40
Show differences only
Flagship COSLUS E40 Learn More
Best Seller COSLUS C20 Learn More
For Kids COSLUS C31 Learn More
Travel Pick COSLUS T40 Learn More
Price
$39.99 $99.99 Price
$42.99 Price
$42.99 Price
$29.99 Price
Best For
Sensitive Gums & Precision Control Best For
Everyday Cleaning Best For
Gentle Cleaning for Kids Best For
Travel & On-the-Go Care Best For
Pressure Levels / Modes
10-Level Dial Control Pressure Levels / Modes
4 Cleaning Modes Pressure Levels / Modes
4 Cleaning Modes Pressure Levels / Modes
4 Cleaning Modes Pressure Levels / Modes
Water Tank
300 mL Water Tank
300 mL Water Tank
150 mL Water Tank
180 mL Water Tank
ADA Accepted
Yes ADA Accepted
Yes ADA Accepted
No ADA Accepted
No ADA Accepted
Tips Included
5 tips Tips Included
5 tips Tips Included
2 tips Tips Included
4 tips Tips Included
Warranty
Up to 2-Year Warranty Warranty
Up to 2-Year Warranty Warranty
Up to 2-Year Warranty Warranty
Up to 2-Year Warranty Warranty

Professional Clean. Live Freely.

COSLUS is dedicated to creating wireless water flossers that make professional-level oral 

care simple, comfortable, and accessible for everyone.

Discover Our Story
Woman relaxing at home as part of her daily wellness routine
White COSLUS cordless water flosser stored with bathroom towels
Traveler packing beside a black COSLUS cordless water flosser
White COSLUS cordless water flosser displayed with oral care essentials
Couple using COSLUS cordless water flossers together in a bathroom
White COSLUS cordless water flosser beside a bathroom sink

Over

10,000,000+

Users Choose COSLUS

Man holding a mint green COSLUS cordless water flosser
COSLUS customer holding an E40 cordless water flosser box
Woman holding a white COSLUS cordless water flosser
COSLUS customer using a water flosser with braces
Smiling COSLUS customer with braces holding a cordless water flosser
COSLUS customer brushing her teeth as part of her daily oral care routine
Man holding a mint green COSLUS cordless water flosser
COSLUS customer holding an E40 cordless water flosser box
Woman holding a white COSLUS cordless water flosser
COSLUS customer using a water flosser with braces
Smiling COSLUS customer with braces holding a cordless water flosser
COSLUS customer brushing her teeth as part of her daily oral care routine

Over

10,000,000+
Users Choose COSLUS
Man holding a mint green COSLUS cordless water flosser
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COSLUS customer holding an E40 cordless water flosser box
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COSLUS customer using a water flosser with braces
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COSLUS C20 Dual Stream® Cordless Water Flosser
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Smiling COSLUS customer with braces holding a cordless water flosser
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COSLUS customer brushing her teeth as part of her daily oral care routine
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