The Associated Press published a study performed on the effectiveness of flossing, and their conclusion, after not getting the information they felt was needed to prove it’s scientific basis, is that flossing is a waste of time.
However, if you ask Dr. Biderman, you will get a much different response. Bacteria forms in the gums, known as Biofilm; and if this stuff is n=handled with proper flossing, then it can lead to bad breath, bone loss, and much more.
Your life is your own, but if all you had to do to create peace of mind was to floss once a day, why not do it? Just something to consider. You can read more about the study here: http://bigstory.ap.org/article/f7e66079d9ba4b4985d7af350619a9e3/medical-benefits-dental-floss-unproven