Dental floss is used to slide the floss into the gap between the teeth and move up and down to remove food debris and soft tartar from the gap between the teeth. The precautions for flossing are not to use too much force to damage the gums, and to pay attention to the fact that the neighboring surfaces of each tooth should be removed, including the back of the last tooth. 1. Usage: Before using dental floss need to clean hands, then take the length of dental floss 15 ~ 20cm, the ends of the floss were wrapped around the middle finger of both hands, the use of dental floss can also be used with the index finger or thumb to assist in order to tense the floss. Straighten the floss to ensure that the length of the floss between the two fingers is 1~1.5cm, and place the section of floss into the gap between the two teeth. Apply light pressure in the direction of the neighboring surface of one tooth so that the floss wraps around the neighboring surface of the tooth in the shape of a C. Scrape from the bottom upward 4 to 6 times. If repeated, ensure that the adjacent surface of each tooth is cleaned. If the floss has a handle, you can complete the operation by directly holding the floss handle and placing the floss into the gap. Pake note: Do not use too much force in the process of flossing, otherwise it is easy to make the gums scratched. After flossing, use mouthwash or water to clean the food debris in the mouth. When flossing, you should pay attention to the adjacent surfaces of each tooth to clean, and do not forget to clean the back of the last tooth.