I've been using Waterpik for decades now, my first one was a gift from my parents. Excellent for total and thorough dental health. One flaw however, is the fact that the flexible plastic tubing wears out after about two (2) years of use. Suggestion: make a repair kit with a glue suitable to mend and weld the tubing where it breaks down.
I finally followed my dentist's advice and bought a water pik ! I always envisioned that it might be painful to use but it is totally the best thing ever. I brush my teeth and then really enjoy using the water pik and getting my teeth and gums extra clean.