My periodontist recommended I buy the WP-100 so I could clean below the gumline and under the teeth. It seems to work well - I can feel the water stream getting in there - but time will tell. As a floss replacement, I love it. It's odd at first using it, with the mouth open and water flowing/splashing out into the sink. But it feels good. My only quibble is the noise. Good grief! I use this in a small half-bath; that only magnifies the sound of the little motor. It'll probably be many years if not never before I replace it, but Waterpik really ought to sound-insulate this little bugger a little more effectively.
This is a great supplement to regular tooth brushing. Use it prior to tooth brushing so that the teeth will be free from debris. Good for those with dental crown too to ensure no particles are left in the junctions and crevices.
I have had my waterpix over a month now and I love it. It really knocks off the plaque that forms on your teeth. It has been 2 mo since I had my teeth professionally cleaned and I have been able to keep the plaque off with my waterpix.
I bought this several years ago and have just started using it. I wish I had been using earlier. Since using it my gums are healthier and so are my teeth. I had skin grafts in my mouth before and my dentist says if I continue on with my dental hygiene practices it is doubtful I will ever need another skin graft.