Interdental or Interproximal Brush is use to clean the teeth where the toothbrush bristles can't get access to. Removing the PLAQUE is necessary to prevent cavities and gum disease.
Gum Disease will cause destruction of the bone eventually and leave large triangular spaces between teeth. In addition to flossing and brushing, interproximal brush is used as an adjunct in cleaning where toothbrush can't reach.
Dr. Jeff D. Velasquez