GUM Expanding Floss is easy to use because it’s designed with a thin string that gets between tight interdental spaces and below the gumline with minimal effort. Once there, the floss expands, making it able to contact broader surface areas between the teeth and gums. This allows for easier removal of food particles and dental plaque from areas where gum disease and tooth decay can begin to take hold. For added convenience, this floss comes in a see-through container that allows you to monitor floss usage, which helps you to know when to reorder when you start running low.