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The Waterpik Cordless Gem 5100 is a rechargeable, waterproof cordless water flosser built for sink-side or shower use. It runs on a built-in battery and delivers a pulsating jet to clear food and plaque between teeth and around braces. It suits people who want a portable flosser without a cord or countertop footprint, but its smaller reservoir and lower pressure ceiling mean it trails full-size countertop models on capacity and intensity. It is a good travel and small-bathroom pick rather than a replacement for a high-pressure plug-in unit.
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Lowest price we've seen: $79.99 on Nov 11 at Best Buy. Tracked across 1 store since Nov 11.
Owners of the Cordless Gem line generally like the freedom of a cordless flosser and its shower-friendly build. Common complaints center on the small tank and weaker jet compared with countertop units.
