Mostly people use regular toothbrushes to clean and maintain teeth. They are good, but can not clean between two teeth. That place can be only cleaned with floss when the teeth are tight or later in life when space appears between teeth near gum level, then that needs an extra brush called Inter Dental brush or Proxa brush. Much decay in teeth develops between teeth if these areas are not kept clean. The video shows how to prevent decay by using an extra interdental brush.