It's a sad fact that one those little follicles have been starved of their blood supply by DHT for too long, there dead for good. Finasteride will slowly cleanse the follicles and will improve the blood supply, but if you're too late, they're not gonna grow back. Too often I hear finasteride talked about as a miracle drug, alas it's not, it will not regrow hair, just promote growth of dying (but still viable) follicles.