What is the primary motion for floss contacts with a knot in floss?

The primary motion for flossing contacts, particularly when using a knot in the floss, involves a horizontal direction. This approach is crucial for effectively maneuvering the floss between the teeth, especially in areas where contacts are tight.

When flossing, the aim is to create a clean space by gently sliding the floss between the teeth rather than forcing it, which might lead to gum injury. The horizontal motion helps to push the floss against the sides of the teeth, allowing it to remove food particles and plaque effectively.

Using a knot in the floss can be advantageous in certain situations, such as anchoring the floss more securely, but it requires careful movement to avoid cutting into the gum tissue. Therefore, maintaining a horizontal movement ensures that the floss can flexibly wrap around the tooth's contour during cleaning while minimizing the risk of discomfort or injury to the gums.

In summary, the horizontal direction is not only the most effective motion for cleaning between the contacts but also aligns with the goal of maintaining oral health through safe and effective flossing techniques.