So... this Waterpik is amazing. By the way this is my first review ever on Amazon after ordering numerous of things. So I had 4mm and 5mm periodontal pockets from not flossing and also experienced some bone loss, I also had to get a very uncomfortable deep gum pocket cleaning. I literally hated flossing and would find myself avoiding to floss even though I needed it very much. My gums were red, swollen, and inflamed because I was in the early stages of periodontal disease. I started using the Waterpik flosser, and instantly like this way of flossing much better! After using it consecutively each night for only 5 days my gums were noticeably better and felt much better. After 2 weeks of using the Waterpik flossing, coconut oil pulling, and mouthwash treatment, my gums have done a complete 180 and my mouth and gums are starting to heal properly! Also this flosser can be somewhat loud, but definitely gets the job done ( but the dentist still recommends string flossing). Brought this with my own money and this is an honest testimonial/review. I will be back with an update on what mm my gum pockets will be!