Women with uneven nails are generally nervous people without much self-control. Biting your nails is a sign of impulsive perfection — “the biter is on a constant quest for order, busily evening the edges, until there is no more edge to even,” Valinoti says.

Use an oil like SolarOil, $15.99, to keep even ragged nails looking healthy and fresh. “This will help increase the longevity of your manicure because it moisturizes the nail polish, preventing cracking and chipping,” Valinoti says.