How long does a bottle of fingernail polish last?

On average, an unopened bottle of nail polish can last for up to 2 years, while an opened bottle can last between 1 and 2 years. If stored properly, nail polish can last even longer. To help extend the life of your nail polish, store it in a cool, dark place away from direct sunlight. Keep the bottle tightly closed when not in use and avoid exposing it to extreme temperatures. Additionally, avoid adding anything to your nail polish bottle, as this can contaminate it and reduce its lifespan.