The life span of the makeup depends entirely on the type of makeup. Mascara should be replaced every 3 months, and if the product has not had any exposure to water, eyeliner pencils and powder eyeshadows can last up to a year. Powder makeup, such as powder blushes, bronzers, and foundations, are safe to use for 9 months to a year if there is no water present within the product. Cream makeups on average can be used up to 9 months, but if you have acne problems or are exposing the product to your fingers it is recommended to replace more frequently. Lip gloss and lipstick should be replaced every 6 months especially if you have sensitive skin. In general, if you have an illness (cold sore, pink eye, cold or flu), that has directly contaminated your product, you should replace that item and clean your exposed brushes.