Actually, nothing. If you've always had them, you always will. If you never had them before and just started to notice them, one reason could be stress or simply the fact that you're getting older. As we get older the nails on our hands & toes become ridged. In order to get a smooth polish application just GENTLY buff the nail surface with a white block buffer, remove the dust, apply a ridgefiller base coat, two coats of polish, and finally a topcoat.
