There are 5 Waterpik coupons that include promo codes and free shipping deals for May 2019 for you to choose from. Use a coupon to save on dental products at Waterpik. Keep your teeth and gums looking great every day of the year! Waterpik gives you that dentist-clean feel right from your home, and is easier than traditional flossing. Shop the line of helpful dental care products and save!