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You need a long strand so that it’s easy to grip. Additionally, you’ll use a fresh section of floss when you switch teeth, so it’s helpful to start with a long piece of floss. If the piece of floss you pull off is too short, it’s no big deal. You can just pull off a new piece of floss when you need it. Start with 1 hand, then do the other. Make several loose wraps around each of your middle fingers until the floss pulls taut. However, don’t wrap the floss so tightly that it digs into your skin or cuts off your circulation. The wrap should feel loose and comfortable around your fingers. If the floss feels like it’s wrapped too tightly, unwind it and try again. Use the thumb and forefinger on each hand to hold the floss, and create a space of about 1 to 3 in (2.5 to 7.6 cm) between your hands. This is the part of the floss you'll be using to floss your teeth. As you floss, you’ll move your fingers along the floss to isolate a fresh section for flossing. Work with sections that feel comfortable for you. If a larger section feels right, then it’s okay to leave more space between your hands.
Break off about 18 to 24 in (46 to 61 cm) of dental floss. Wrap the ends of the piece of floss around your middle fingers. Hold a 1 to 3 in (2.5 to 7.6 cm) section of floss between your thumbs and forefingers.