Waterpik Flossing Toothbrush – Costco Sale! by Rhonda October 30, 2022 For the 2022 Version–> Waterpik Evolution and Nano Water Flosser Combo – Costco Sale! *UPDATE* 10/25/21. With the Waterpik Sonic-Fusion 2.0 Flossing Toothbrush from Costco, you can brush and floss … 0 FacebookTwitterPinterestEmail