Brushing alone is not enough! The Waterpik Water Flosser provides a unique combination of water pressure and pulsations to clean deep between teeth and below the gumline, removing harmful bacteria and debris that traditional brushing and flossing can't reach. The Cordless Express dual water pressure control system allows you to personalize your water pressure intensity. The Cordless Express includes 3 AA batteries and an easy-to-fill reservoir. The Cordless Express Water Flosser is a great solution when you want the convenience of cordless water flossing. Battery operated and portable, it's perfect for use in smaller bathrooms or for travel. And it's perfect for anyone with braces or implants, and those with crowns, bridges, and veneers. Age Group: Adult.