While color separation is one sign of age, Wang says it's important to look for other changes in a nail polish's color and texture. If the hue has changed since you bought it or it looks thick and gloopy, it's likely past its prime. Another huge red flag is odor, adds Berry.

OPI stands for Odontorium Products Inc. It was initially founded as a dental supply company in 1981 but later shifted its focus to the nail care industry. Today, OPI is known worldwide for its high-quality nail products and is a leading brand in the professional nail care industry.

OPI Infinite Shine is a regular nail polish lacquer that performs like a gel, so it's kinder to the nail's surface than most gel formulas and removes easily without needing an acetone soak.