Once a child has two teeth that touch each other, it is time to introduce flossing as part of a healthy, regular routine. You should floss your child’s teeth once per day which will take approximately 2 minutes. Cut off 18 inches of floss and hold it securely by either wrapping it around your middle fingers or holding it tightly between your thumbs and index fingers. Move the floss up and down around every tooth surface, making sure to get below the gumline, as well. For best results, the floss should be shaped into a C so that it can better reach all surface areas. Throw the floss away when done.