I. What is dental floss? Floss: Coils made of nylon thread, silk thread or polyester to clean plaque on the adjacent surfaces of teeth are very effective. Application: It is especially best for flat or convex tooth surfaces. When there is a feeling of tightness but cannot pass, do a back and forth sawing motion through the contact point and gently reach the tooth surface under the contact point while placing the floss at the bottom of the gum sulcus to clean the gum sulcus area, being careful not to press hard into the tissue too deep below the gum sulcus. Time: Flossing is best done once a day, especially after dinner. Applicable people: Whenever possible (especially for middle-aged and young people without large gaps), flossing should be used as much as possible, which is beneficial for the long-term maintenance of oral health. The choice of floss: the choice of floss is a personal preference, in fact, as long as the use of its method, any kind of floss can effectively remove plaque, tartar. Caution: Do not use too much force when flossing to avoid damaging your gums. Use different sections of floss to get into different gaps to keep always flossing clean to remove plaque from adjacent surfaces. It is more efficient and safer and healthier. II. What is an interdental brush? Interdental brush: resembles a small scrub bottle, a single bundle of bristles, there are a variety of different sizes and models to choose from, smaller interdental brushes are usually inserted into the handle for easy grip. Uses: 1. Used to remove plaque from difficult self-cleaning surfaces and interdental spaces. For example, the depression inside the premolar, floss and toothbrush are unable to clean, can choose the appropriate form of interdental brush, back and forth friction, in order to remove the root bifurcation, jaw concave surface, the last molar far in the face of the plaque. 2, when there is tooth alignment is not neat, the mouth has a complex restoration or gum atrophy, root bifurcation exposed, can be used specially designed interdental brush to remove inter-adjacent dirt, its effect is obviously better than toothpicks or dental floss, if you can make 3.It can also be used to clean orthodontic appliances, fixed restorations, dental implants, periodontal splints, gap retainers and other parts that are difficult to reach with a common toothbrush. Note: The interdental brush used must be slightly wider than the gap between the teeth to be cleaned, no special technique is required.