Amazon Lightning Deal Expires10amPST. Amazonhas the Oral Irrigator Portable Dual-Speed Water Flosser for a low $17.99. Free Shipping on orders $35+ or Free 2 Day Shipping (No Minimum) with Prime Membership. Tax in many states. This oral irrigator normally sells for $29.99 ($50 list price), so you're saving 40% off with this deal. Penetrating water jet cleans spaces between teeth to fight plaque and gingivitis Gentle stream of water is safe and non-abrasive to your gums and teeth Angled irrigation nozzle reaches difficult corners of the mouth Perfect solution for cleaning around dental implants, bridges and braces. High/low speed control offers flexibility to users with gum sensitivity. 1-year warranty