If you have fine lines on your forehead, how come no cosmetic ingredient can actually fix them? Isn't the wrinkle on the epidermis after all (thus you wouldn't need a drug)? Moreover, why doesn't the skin naturally repair them?
Here's an interesting scenario...If you took a blade and made a light slit over a wrinkle, would the wrinkle/fine line still be there once the cut heals? After all, I would think it's part of the same skin that was just injured.