Remove polish every two weeks and give your nails a breather for a day or so. Or switch to light polish, which doesn't need to be changed as often since there's a lower risk of it staining your nails.

When should you remove nail polish?

According to Seventeen, polish should last for up to two years once opened, but if it's still separated and "won't blend after a quick shake," toss it.

How long should you leave nail polish on before removing?

OPI Nail Polish and Lacquer Remover. Give yourself plenty of time for the removal process and most importantly, do it in a well-ventilated area so you're not breathing in all that acetone, says nail expert Jenna Hipp. The process can't really be done in a rush — you'll need about 30 minutes.