Maintaining good oral hygiene goes beyond regular brushing, and that’s where a water flosser comes in handy. Today, we’re reviewing the Coslus E40 Water Flosser, a budget-friendly yet powerful device from the emerging Chinese brand Coslus. Despite being relatively new to the market, Coslus has already gained recognition for offering cost-effective personal care products. This particular model has even been featured as one of the best wet-use flossers by online review sites.
But does it live up to the hype? Let’s take a closer look.
Unboxing the Coslus E40
Inside the package, you’ll find:
The E40 water flosser
A full set of attachments, including various tips for different cleaning needs
An instruction booklet
A 24-month (2-year) warranty card (Remember to register the device online within 7 days of purchase to activate the warranty)
A quick-start guide on the back of the warranty card for those who prefer a simplified setup
Additionally, the accessories box contains five nozzle tips, including a standard nozzle, small brushes, and even a tongue and inner cheek cleaner, making this a highly versatile device.
Charging & Battery Life
The Coslus E40 is rechargeable and comes with a USB extension cable for charging. However, there’s a slight drawback—the charging cable does not use USB Type-C. Instead, it features a proprietary B-shaped connector, similar to those found in personal care devices like shavers and trimmers from Philips, Panasonic, and Braun. While this design helps with water resistance, it means that replacing the cable could be tricky if it gets lost. It would have been preferable if Coslus had included a USB-C option for universal compatibility.
That said, the battery life is impressive. Depending on usage, you may only need to charge it once every two weeks—a significant advantage for those who prefer low-maintenance devices.
Design & Size
One of the first things you’ll notice about the E40 is its size—and it’s big. Compared to a manual toothbrush, a Philips portable irrigator, or an electric toothbrush, the E40 is significantly larger. Even when placed next to a large bottle of mouthwash, it still stands out. While it’s technically a portable device due to its cordless design, it’s more suited for home use rather than travel.
Another small downside is the lack of built-in storage for the extra attachments, meaning you’ll need to store them separately.
Why Is It So Big?
The E40 features a massive 300ml water tank, one of the largest for self-contained, cordless water flossers. Most larger tanks are found in countertop models with separate hoses and nozzles. Having such a large tank means fewer refills per session, which is a great advantage if you like to take your time while flossing. However, if you prefer something more compact, Coslus does offer smaller models as well.
Filling the tank is straightforward—just open the latch at the bottom and pour in water. To prevent limescale buildup, it’s recommended to use filtered or boiled water and clean the tank occasionally. Also, always empty the tank after use to prevent bacterial growth. If you prefer, you can even fill it with mouthwash instead of water.
Ease of Use & Functionality
Using the E40 is incredibly simple:
Attaching a nozzle is as easy as pushing it in until it clicks
To remove, just hold the release button and pull it out
It features two modes:
Regular flossing: Removes food debris and plaque
Massage mode: Stimulates gums, tongue, and inner cheeks
The device delivers a constant flow in small bursts, and it has a pressure dial with 10 intensity settings—making it adjustable for different preferences and suitable for multiple users in a household.
A Special Highlight: The Tongue Scraper Attachment
One of the standout features is the tongue scraper attachment. If you’re someone who regularly uses a tongue scraper, this feature makes the process much easier.
Who Should Use This?
If you wear aligners or permanent braces, a water flosser is essential for maintaining oral hygiene. The E40 makes cleaning between your teeth much easier and is a great supplement to your routine.
Final Verdict: Is It Worth It?
A water flosser is not a replacement for traditional flossing, brushing, or professional dental cleanings (which you should still get every six months). However, it’s a great addition to your oral care routine, and dentists recommend it as a supplement to brushing and flossing.
For those looking for an affordable yet effective water flosser, the Coslus E40 is definitely worth considering. Despite being budget-friendly, it delivers performance comparable to premium brands like Philips— but at nearly half the price.