I've used the WaterPik for over 10 years now. I just replaced my original one and love to use it daily. For years now, my dentist has praised my tooth and gum health and she attributes my positive checkups and cleanings to my WaterPik.
Easy to use, powerful, setting features are great - (power setting / on-off / pause button) all make for ease of use. Included with this set are multiple tips that are very easy to change (pop/snap in & out).
I was unhappy when the dentist said that I gum disease. Friends have told me how much their gums improved using Waterpik. I'm looking forward to a better checkup next time.