This is the greatest device I have ever used for cleaning my teeth/mouth. I feel that it gives an on-par if not better cleaning then a professional dental hygienist's cleaning! It was recommended to me by my dental hygienist to ensure my 2 crowns are well cleaned, and I love it!
I bought the Waterpik couple of months ago. I regularly floss and was surprised how much food leftovers remain between the teeth that is removed with Waterpik. Great way to extend the life of your teeth.
I have used the WaterIk for many years after my old one died, maybe five years, I purchased a new one. I have not had a cavity since using it in my daily mouth routine. Cost of the Wayerpik... Peanuts compared to the cost and discomfort of getting a filling. My dentist always says I have young teeth and gums and I know it it partially due to the efficient performance of this great device.