It is very important for you to remember – cosmetic products must indicate by when they can be used or how long they should be kept. This is a “best before date” or “period after opening” (PAO) symbol.
For products with a lifespan longer than 30 months, they must have a “period after opening ‘time. This means that after the product by the consumer is open for the first time, has a shelf life of many months under normal conditions of use.
This number indicates the number of months for as long as the product is safe to use after it is opened.