Can pick out unwanted leftovers, remove plaque where your toothbrush can't reach, helping to fight tooth decay and keep your teeth clean High Toughness strong rally and smooth round wire, it will not hurt the teeth Dental floss is made of food-grade polymer scribed. It is high Toughness strong rally and smooth round wire, it will not hurt the teeth. The floss handle is made of polystyrene and is extremely durable The handle design is located at the golden point of the floss, and the middle part adopts a convex design to enhance the hand feeling and save effort and protect the teeth Package included 250pcs dental floss with 2 portable cases, easy to carry and can be placed in a wallet, briefcase, car, pocket, or bag The polymer floss design, toughness, wear resistance, slim shape, and more comfortable slide into the tooth gap, cleaning more thoroughly. Steps for usage: Move part of the floss around the teeth gap and slowly slide into the teeth. Put the floss into one side of the tooth closely, gently pull up and down the floss to clean the adjacent teeth. When encounter a large residue, the other side of the floss can be used for cleaning. Children and the elderly can use it. Note: Do not use the floss and toothpick with force in case of hurting the flesh. Children need to be accompanied by parents to teach and use. The product must not be swallowed.