1: Take a 45 cm section of floss and wrap the end around the middle finger of each hand, leaving 5-7 cm between the two fingers. 2.Tighten the floss with your thumb and forefinger, leaving a width of 3 cm. 3. Gently slide the floss back and forth between the teeth until it passes through the contact point. 4.Wrap the floss around a tooth surface in a “C” shape, press it against the tooth surface and gently remove the plaque. 5.Pull the floss out of the gap and wrap more around one finger to reveal a clean section of floss. 6.Repeat the above steps to clean the tooth surface of the next tooth, and finish in order for the whole mouth. It is important to note that some people may experience bleeding gums when flossing for the first time. There are two reasons for this: 1. Due to inflammation of the gums, after systematic treatment, as long as the method is correct and lasts for a few days, once the plaque is cleared, the bleeding will stop. 2. After systematic treatment in an incorrect way, if the bleeding continues for a few days, it is recommended to return for a review, as incorrect flossing can also lead to gum damage. In addition, flossing will not increase your gap. Flossing can be bought at hospitals or supermarkets or clinics. By getting into the habit of flossing, you can have a good set of white teeth and a bright smile.