I have only used this once. It seemed to be working just fine. I have an older one that I am still using, but bought this one if my current one eventually breaks down. I am 89 years old and still have all my teeth, although some are crowned. I credit my good dental health to the use of a waterpik for many years.
This was recommended by my dental hygienist. Picked this up after my dental appointment. Love it. Takes flossing to a new level and makes my teeth feel very smooth.