I purchased this for the first time and I noticed an almost immediate improvement in my oral health. The hard to reach places that dental floss was not reaching improved within a couple of weeks of daily use. My dentist recommended I use Listerine instead of water, so I have been doing that. I do rinse out the Waterpik regularly. No complaints!
This is my second Waterpik. I truly believe this unit increases the health of my gums. I also feel that my mouth feels cleaner and refreshed after using it. It will always be part of my daily dental health process.