Depends on the shape and state of the hoof, but in a horse with a long toe, and many horses, especially shod ones have that, it will bring the point of breakover back closer to where it should be. The horse will then be able to move more freely and correctly. Bit like us wearing shoes a size or two too big. My horse went from regular shoes to rolled toed Natural Balance shoes and it made quite a difference to her.
Wild horses living in rocky semi desert conditions roll their toes naturally.