COSLUS Water Flosser for Teeth vs OasiSmile FC180 Water Flosser

Both are corded countertop flossers with 600 ml tanks, so the real split is control and track record. The COSLUS gives you 12 pressure levels against 10, a rotary dial that is easier to fine-tune, and a much larger base of 425 ratings at 4.4. The OasiSmile adds a fifth jet tip and a slightly smaller footprint, but 93 ratings at 4.1 is a thinner record. Buy the COSLUS for most households; pick the OasiSmile if you want the extra tip for a larger family.

• Choose the COSLUS if you want finer pressure control, a bigger pool of owner feedback, and a gift-ready box.
• Choose the OasiSmile if you need an extra jet tip for a family of four or more and want a more compact unit.