Ever since I have tried those firm toothbrushes, I cannot go back to medium ones, teeth do not feel nearly as clean. These last me pretty long, bristles don't lose the stiffness even after 3months when I start using a new one for hygienic reasons.

I only use firm bristled toothbrushes & there's hardly any on the market Reach do two both are great the difference being the bigger kink in the neck of the brush enabling the head to become slightly more flexible both leave you with a clean refreshed...