In the world of dreams the rules of reality do not necessarily apply. Each dream is unique and it's a direct link to the soul and spirit. Psychology provides its own theories on what dreams mean, but so did tradition and the study of dreams for thousands of years before any relevant science had developed.
Dream Meanings - Fingernails
If your fingernails are clean and cared for you will have financial gains, but if they are dirty and uncared for then keep an eye on your finances. If you clip your nails then you will be freed of some problems.