Much like food comes with stamps and labels advising you to use the product before a specific date, cosmetics follow a similar practice. The difference with cosmetics is that there is a life expectancy image cleverly placed on (usually) the label sticker, with a number inside of it. The numbers will vary from months to years. This applies to the open date, as air starts to get in and around the particles and contaminate all the good relations you worked so hard to cultivate.
Check out some of the Sally Beauty tips for how to use the life expectancy dates, and what items are on sale to exchange your oldies (although I have to admit, I disregard the signs sometimes!).
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Sometimes Yaya 