I was introduced by my orthodontist about water flossing. However the one that my orthodontist had on display was too pricey. So i took it upon myself to search for one to try that was lesser value. So i found the water pik 100 an fell in love with it with my first use. I immediately knew that there was no need to return it. An this was a must have as well for my son. My son experienced swollen gums cause it was hard for him to floss. Now with him using this product his gums are healthy/no longer swollen. The variety of attachments makes flossing a get experience for all. An please register your product. It will help the representative if you have any matters regarding your product easier.