Which is better for braces?

The Waterpik Cordless Pulse is the safer pick. It is ADA accepted and Waterpik sells orthodontic tips for braces, though the WF-20 ships with only Classic Jet tips. The COSLUS C30 has more pressure modes, which helps around brackets.

Which has the longer battery life?

The Waterpik Cordless Pulse. It runs up to 9 weeks per charge on a lithium-ion battery and charges over USB-C. COSLUS does not publish a battery figure for the C30.

Is the COSLUS C30 worth the savings?

Yes if you want more pressure settings and a bigger tank for less money. You give up the ADA Seal, the shower rating, and the two-year warranty.

Can I use either in the shower?

The Waterpik Cordless Pulse is waterproof and rated for shower use. COSLUS does not state a shower rating for the C30, so keep it dry.

Which is easier to refill?

The COSLUS C30. Its 300 ml tank detaches with a wide mouth. The Waterpik's 6 oz reservoir is removable and top-rack dishwasher safe but smaller.

Both are rechargeable and should last years with care. The Waterpik backs its unit with a 2-year limited warranty; COSLUS does not state one.

Waterpik Cordless Pulse Rechargeable Portable Water Flosser for Teeth, Gums, Braces Care and Travel with 2 Flossing Tips, Waterproof, ADA Accepted, WF-20 White vs COSLUS C30

Buy the Waterpik Cordless Pulse if you want a proven, shower-safe flosser with a long battery life and a two-year warranty. Buy the COSLUS C30 if you want more pressure range and a bigger tank for less money. The Waterpik WF-20 is widely listed around $60-70 and the COSLUS C30 around $30-40, so check the latest prices at each store before you decide.

Ask our shopping agent