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The Waterpik Ultra WP-100 is a countertop water flosser that plugs into AC power and delivers up to 10 pressure settings through a 360-degree rotating tip. It has a covered reservoir with in-lid tip storage and a water on/off switch on the handle, and it is ADA-accepted for safety and effectiveness. It suits braces, implants, crowns, bridges and periodontal pockets. At $37.50 at eBay as of November 7, 2026, it sits at the low end of its recent price range, well under the $60-$70 it often sells for.
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Lowest price we've seen: $48.88 on Nov 7 at eBay. Tracked across 7 stores since Nov 7.
With 4.5 out of 5 from 14,645 ratings, owners largely rate the Ultra highly, citing cleaner-feeling gums and easier use than string floss. Complaints center on the countertop footprint, reservoir refills and noise at high settings.
The Waterpik Ultra water flosser oral irrigator WP-100 in White delivers maximum water flossing performance, making it easy for anyone to have healthier gums and cleaner teeth in 1 minute a day. And it's great for anyone with braces, implants, crowns, bridges, or periodontal pockets. The Waterpik Ultra water flosser features 10 pressure settings, a contemporary design, a covered reservoir with in-lid tip storage, and water on/off switch built into the handle to easily control water flow, and 360-degree tip rotation to easily reach your whole mouth, even back teeth. Waterpik is the #1 water flosser brand recommended by dental professionals, and the Waterpik Ultra water flosser is accepted by the American Dental Association (ADA) for safety and effectiveness.
