After I clean my teeth with my ultrasonic toothbrush, and I use my waterpik you wouldn't believe the little particles of food that are flushed out. I truly believe it is more efficient and does a better job than flossing. I actually had a loose lower bicuspid, that my old dentist wasted to perform a root canal and crown on, and since using my waterpik it has tightened. My new dentist feels my tooth is now fine. As a RN I would definitely recommend the use of a waterpik for gum and dental health.
My bf had one and I always poo-pooed it, saying it could't be any better than simply using dental floss. I was wrong. I bought the WP-100 on the recommendation of my dentist and have been thrilled from day one.