Having white fingernails doesn’t always come naturally. Something that I learned while in esthetics school, from someone that I was practicing pedicures on, was how to whiten your fingernails with Polident.
Polident is actually a denture cleaner and stain remover but it makes complete sense how this would help whiten the whites of your nails.
She told me that all you do, is fill a bowl with water, add a Polident tablet to the bowl and soak the fingertips for 5 minutes. If your nails have yellowed from a particular nail polish, it may take up to 3 times to remove the stains.
Before learning this trick, I used a nail whitening pencil on the underneath part of the nails which works well too for a quick fix.