Interdental brush is a modified toothbrush used for cleaning between teeth. It is best used in cases where the gingiva does not fill the space between teeth or when there is orthodontic therapy present.
Interdental brushes are usually very small and specially designed brushes for cleaning between the teeth. Interdental brushes are best when the spaces between your teeth are too wide to use floss. Interdental brushes come in different widths to match the space between teeth.