If you have black triangles from gum recession, then I highly recommend TePe interdental brushes (or some other brand). Neither a toothbrush nor floss is going

If you have black triangles from gum recession, then I highly recommend TePe interdental brushes (or some other brand). Neither a toothbrush nor floss is going to clear those areas effectively, and I noticed an immediate improvement in my gum inflammation levels when I started using them.