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Does being extra soft make it better or can you get to soft?
Well you want the bristles to be strong enough to remove plaque and food particles, so I guess there can be a point where the bristles can be too soft.
I will admit I don't know much about the badger hair toothbrushes. But the rule of thumb is to only use soft bristle brushes because the medium and hard bristles scratch the teeth and gums leaving rough edges for cavities to form and gum recession.