Which is better for gum care?

The Genkent is marketed for gum care and holds more water. The COSLUS gives you 12 pressure levels, which makes it easier to floss gently at first.

Is the COSLUS worth the extra $4?

Yes for most shoppers. It has a much higher rating from more buyers and adjustable pressure. The Genkent only wins if tank size is your priority.

Which has the bigger tank?

The Genkent, at 800 ml versus 600 ml. That means fewer refills, but also a bulkier unit.

Which one lasts longer?

There is no reliability data for either. The COSLUS has the better buyer rating, which is the closest signal available.

Can I use either one for travel?

Both are corded countertop units, so neither is a travel pick. The COSLUS lists travel among its uses, but it still needs a power outlet.

COSLUS Water Flosser for Teeth vs Genkent 800ml Water Flosser

Buy the COSLUS if you want a proven countertop flosser with 12 pressure settings and a 4.4 rating from 425 buyers. Buy the Genkent only if the larger 800 ml tank matters more to you than reviews and adjustability. The COSLUS is $36.93 at Walmart and the Genkent is $32.99 at Walmart, both as of November 7, 2026, so the gap is about $4.

Today the Genkent 800ml Water Flosser costs $3.94 less at its best price.

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