Unused items for sale. Den Tek Orthodontic Bridge & Floss Threader There are 50 pieces in the package, and I used 2 or 3, so there are 47 or 48 left. [Retail Price] 999 yen The threader is used to insert into the gaps of orthodontic appliances to make it easier to thread floss. It's similar to GUM Sunstar Gum Through Floss Threaders. *Please note that this is not floss itself.