• There is no reason to use hard or even medium bristle toothbrushes. They are sold because there are people who buy them.

  • You should only choose a soft toothbrush.

  • People think hard brushing is needed for better result.

  • Teeth are hard but plaque is soft. There is no need to brush hard.
    - Brushing hard causes wearing of the thin top layer of gum which them   shrinks away from the neck of the tooth and is irreversible. A simple   choice is tapered toothbrush as it is gentle on the teeth and gums and   cleans the gum lines well.