1. 牙線拉出約45公分，纏繞在雙手中指第2指節，比出手槍的姿勢。以雙手大拇指及食指打直撐住牙線，約留下1公分牙線以供操作。
   
2. 牙線拉成C字型，緊貼牙面，上下刮。
3. 牙線是用來刮牙面的牙菌斑，而非只是挑出牙縫間的食物殘渣。
   

How to floss properly?
Break off about 45 cm and hold your floss taut with your thumbs and index fingers of both hands. Leave around 1 cm of floss to maneuver. Curve the floss at the bottom of the tooth and form a C shape. Move the floss up and down against the surface of the tooth and repeat from tooth to tooth. The purpose is to scrape off the plaque, not just the food debris caught between teeth.