Please take a moment to read the CDA Statement on flossing:
CDA Statement on Flossing
The Canadian Dental Association supports flossing as one step of maintaining healthy teeth and gums. Flossing is an effective preventative measure to remove plaque, the main cause of gum disease. The weakness of the evidence supporting the value of floss in the prevention of gum disease is a reflection of the difficulty of conducting the necessary studies, not of the value of flossing for the maintenance of good oral health. Brushing, flossing, eating a healthy diet, and seeing your dentist regularly are all steps in preserving a healthy mouth.
Source: Canadian Dental Association