Some people say that nails develop ridges when your nutrition is poor, but there doesn't seem to be any scientific evidence of this. According to the Mayo Clinic, vertical ridges may be hereditary and aren't anything to worry about. They aren't a sign of mineral or nutritional deficiency, although you may read that on other websites. Ridges may become more pronounced over time: most people's nails change somewhat as they age.
You can't really get rid of the ridges on your nails, but you can cover them with a few coats of carefully-applied polish. Put it on just a bit thicker than usual, letting the excess flow onto the lower portion of your nails, in between the ridges. Give each coat plenty of time to dry before applying another one.
