Three years. Ahc is a high-end brand of facial makeup line, which is often used in beauty shops and does not belong to the public. Ahc is a combination of natural cosmetics and medical cosmetics, advocating green, natural, pure and safe. The unopened shelf life of ahc men's three-piece suit is 3 years, but the shelf life of ahc men's three-piece suit after opening is only 12 months. Because with the increase of usage times, the contact times of ahc emulsion in water with microorganisms and bacteria in the air will increase, which will accelerate the loss of functional components of ahc emulsion in water, so the unsealed ahc emulsion in water needs to be used within one year.