Pretty nails

If you have nails that are tinted yellow from nail polish or you just want to whiten up your nails, use lemon or lime wedges and scrub on your nails.  Then, it's a good idea to moisturize your cuticles with lotion in case you get some of the acid on the skin surrounding your nail.

Here's a tip for prevent splitting or peeling:

Make a soak of warm olive oil and a few drops of vitamin A oil to moisturize nails and make them less prone to splitting or peeling (a result of dryness). "Do it every two weeks to keep them healthy and strong," says Ana-Maria Gheorghiu, a Romanian manicurist and owner of Onyx Salon & Spa in New York City.

Sources:
Mom (cosmetologist)
Women's Health