This dental floss has a thin tip, making it easy to care for the spaces between teeth, even while undergoing orthodontic treatment. Please note that if you are undergoing orthodontic treatment, it may not fit depending on the space between your teeth and the wires. I bought this to try it out and used one, but it didn't suit my teeth, which are new to orthodontics, and it was difficult to use, so I am selling it. *Please be aware that one case has been opened and contains 49/50 pieces. - Brand: Fujita Yusho - Product Name: Wire Inner Floss - Quantity: 99 pieces (※For 2 cases. One case has been opened and contains 49 pieces, and the other case is unopened and contains 50 pieces) - Type: 2-strand floss Thank you for viewing.