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Product Details
The COSLUS E40 rechargeable cordless water flosser is designed to help you find the right balance between comfort and cleaning power.
With 10-level pressure control, you can fine-tune the water pressure to suit different needs, from sensitive gums to everyday and deeper cleaning.
ADA Accepted, the E40 helps remove plaque and helps prevent or reduce gingivitis.
5 Tips for Different Cleaning Needs include two standard tips for daily cleaning, one orthodontic tip for cleaning around braces, one periodontal tip for gentle cleaning along the gumline, and one tongue-cleaner tip for tongue care.
With a 300mL large-capacity visible tank, the E40 is built to make daily oral care easier, more effective, and more adaptable.
This COSLUS E40 comes with a 2-year limited warranty.
Why E40
- Turn the dial, find your perfect pressure.
10-Level Dial Pressure Control - ADA Accepted
Helps remove plaque and helps prevent or reduce gingivitis. - Clean longer with fewer refills.
300mL large-capacity visible tank for fewer refills and a smoother routine. - One flosser for different cleaning needs.
5 pro tips included. - Use in shower.
IPX7 Waterproof
Shipping & Returns
- Shipping: Free Shipping sitewide and Estimated Delivery Time is 5-7 working days by Amazon/USPS/DHL/UPS. Read our full shipping policy.
- Returns: If you’re not 100% in love with your new product, send it back within 30 days for a full refund — We’re that confident that this is the best personal care you’ll ever use. Read our full returns policy.
Professional Clean.Your Way.
Professional Clean.Your Way.
The ADA Accepted professional cordless water flosser, with 10-Level Dial Pressure Control, 300ml water tank, 5 specialty tips, and ergonomic curved body.
Learn More
Jason
J Holton
Jarrod Cox
Why E40 Stands Out
10-Level Dial Pressure Control
Adjust with just one hand.
300ML Tank
Clean longer with fewer refills.
5 Pro Tips
For different cleaning needs.
Up to 30 Days Battery
Cordless, clutter-free.
IPX7 Waterproof
At the sink / Use in shower
For Different Needs,For Everyday Life.
Trusted by 10,000,000+ Users Worldwide
Amazon's No.1 Water Flosser Brand in 2025
I really like the COSLUS cordless water flosser. I use it every night. Before I started using the water flosser, I had bleeding gums. Now, no bleeding at all. I would definitely buy COSLUS again and would not hesitate giving it as a gift.
FAQs
E40 cordless water flosser offers a wider pressure range for different users and oral care needs, making it suitable for the whole family. Even one person may need different pressure in different areas—for example, a gentler setting for sensitive gums on one side and a stronger clean for healthier areas on the other. With dial pressure control, you can adjust the pressure when you clean.
Customer Reviews
Overall rating: 4.8 / 5 from 56 reviews.
Filling the tank is straightforward, and I usually empty whatever water is left when I’m finished. It doesn’t take much extra maintenance.
I’ve taken it on a couple of short trips. It’s not tiny, but being cordless makes it easy enough to pack, and I didn’t have to bring a charger for a weekend away.
It’s become part of my routine before bed. I brush first, use the E40, rinse everything out, and I’m done.
My husband and I both use it, but we prefer different pressure levels. That’s probably the feature we appreciate most.
I have a crown in the back and I pay extra attention around that area. The adjustable pressure makes it easier to clean there without feeling too aggressive.
I mostly use the standard tip, but I’ve tried the other attachments too. I like having options instead of needing a separate tool for everything.
Not having a cord makes it much easier to use around the sink. It also keeps my bathroom counter looking less cluttered.
I don’t charge it very often, which is one of the things I like most. I just keep it on the bathroom counter and top it up when needed.
The tank is a good size for me. I can usually finish my normal routine without stopping to refill it.
My mouth feels noticeably fresher after using it, especially around the back teeth. I like running the stream slowly along the gumline.
I use it a lot after dinner, especially if I’ve eaten meat or anything that gets stuck between my teeth. It’s nice not having to pick at those spots with floss.
I still use string floss sometimes, but I reach for the E40 more often because it’s quicker and I’m more consistent with it.
This was my first water flosser. The first couple of uses were a little messy, but I figured it out quickly. After a few days it just became part of my nighttime routine.
Cleaning around braces takes me less effort with this. I still brush normally, but the water stream helps get around the brackets where food tends to get stuck.
My gums can be pretty sensitive, so I was worried a water flosser would feel too strong. Starting on a low setting made a big difference, and it feels much more comfortable than I expected.
I started around level 3 and slowly moved up to 6. I like that I can turn it down when my gums feel sensitive and use a stronger setting when I want a deeper clean.
I was surprised by how much control the dial gives you. I expected a couple of pressure options, but being able to fine-tune it made it much easier to get comfortable.
Excellent
COSLUS E40 10-Level Dial Pressure Control Cordless Water Flosser
Great delivery timing - good looking unit- works well - good price - and runs on 110 not batteries!
COSLUS E40 10-Level Dial Pressure Control Cordless Water Flosser
There's no real low pressure so water just goes everywhere
COSLUS E40 10-Level Dial Pressure Control Cordless Water Flosser
Easy to find with the keyword 'water flosser'. Easy to order. Arrived quickly. Instructions on how to use are very clear. My teeth feel the difference after use. Would order again.
COSLUS E40 10-Level Dial Pressure Control Cordless Water Flosser
Bit tricky to use - keep spraying myself with water! I am sure it’s just a matter of getting used to it and when I use the higher settings as not much of an impact on teeth hygiene at moment
COSLUS E40 10-Level Dial Pressure Control Cordless Water Flosser
Love that the resevoir is big and the 10 speeds!
This is my first water flosser. I am very happy to feel how much power it has. Easy to use controls. Very nice.
Easy to use. Great quality and price
Absolutely love it, does a great job keeping teeth clean and smooth
It does a great job
COSLUS E40 10-Level Dial Pressure Control Cordless Water Flosser
:)
Great product
This is great…thank yo
Good
Finally a device that is actually powerful enough to do the job coupled with a large water tank / reservoir that allows one to complete the cleaning in one sitting.
Quality wise good,
works real well. glad i got it.
Good
very good
pressure is low when im on the highest level. Disappointed
I love my product. It is a must have if you have any type of dental work.
I love this water flosser it works great,and it was affordable i will make a couple more purchases in the near future.
I like the tips and I like the size that
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