Makeup Shelf Life and Hygiene Basics for a Beginner Kit

Why opened products have a different life than unopened ones

Unopened makeup can sit for years when it is stored at room temperature in a stable formula, but that changes as soon as the seal is broken. According to Cleveland Clinic, unopened, well-formulated makeup is stable for years at room temperature, while once it is opened the ingredients start to oxidize or degrade because they are exposed to the air. The clock that matters most for makeup shelf life is the one that starts on the first day of use.

In the United States, that clock is not regulated on most labels. The U.S. Food and Drug Administration states that there are no U.S. laws or regulations that require cosmetics to have specific shelf lives or expiration dates on their labels, and the FDA considers determining a product's shelf life to be part of the manufacturer's responsibility. Some manufacturers print a Period After Opening (PAO) symbol instead: an open-jar icon with a number inside, such as 6M or 24M, showing how long the product is considered good after opening. Cleveland Clinic explains that symbol, and Revlon also points to the PAO label as the manufacturer's guidance for how long a product stays usable after first use.

There is one important regulatory exception. The FDA notes that makeup with SPF labeling is regulated as both a cosmetic and a drug, and drugs must be tested for stability and must carry expiration dates on their labels. That means a tinted moisturizer or foundation with SPF is not treated the same way as an ordinary cosmetic.

• Unopened, well-formulated makeup can remain stable for years at room temperature, but opened product begins to degrade.
• Most U.S. cosmetics are not required by law to carry a specific shelf life or expiration date.
• A Period After Opening symbol such as 6M or 24M is the manufacturer's own estimate of useful life after opening.
• Makeup with SPF is regulated as both a cosmetic and a drug, and drugs must carry expiration dates.

Sources: U.S. Food and Drug Administration (FDA), Cleveland Clinic (Health Essentials), Revlon

Typical shelf-life ranges by product type

Manufacturers, regulators, and clinicians do not agree on a single set of numbers. Liquid and cream products generally have the shortest useful lives because their moisture supports microbial growth more readily, while dry powders keep longer. Cleveland Clinic explains that dry makeup products such as eyeliner pencils and powder foundation tend to last longer than wet products such as concealer and liquid eyeliner because the moisture in wet products helps bacteria and mold grow faster.

The FDA notes that eye-area cosmetics tend to have shorter shelf lives because they may cause eye infections that can be serious, and it reports that manufacturers usually recommend discarding mascara two to four months after purchase. Cleveland Clinic's general guideline is longer — about six months after opening. Both figures are useful as a range rather than a rule. The table below shows the typical ranges for common items in a beginner kit, with the usual source disagreements preserved.

Sources: U.S. Food and Drug Administration (FDA), Cleveland Clinic (Health Essentials), New York Society of Cosmetic Chemists (NYSCC), Revlon

Signs it is time to replace a product

Because most U.S. cosmetics do not carry a shelf-life date, changes in the product itself are often the clearest signal. Cleveland Clinic advises using changes in smell, texture, color, and performance as indicators that it is time to throw the product out. The New York Society of Cosmetic Chemists describes the same pattern in more detail: a white watery cream may turn yellow and oily, old foundation and concealer may appear more orange, old mascara may smell like gasoline, and creams may separate with oil rising to the surface. Revlon's own guidance is similarly direct: if a product has changed in any way, or if the user cannot remember when it was opened, it is safest to replace it.

A regular review makes those changes easier to catch. The New York Society of Cosmetic Chemists suggests going through the makeup bag every six to twelve months to examine products, check the Period After Opening date on the ingredients label, and look for changes in color, smell, or texture. A simple version for a beginner kit is to pick a date twice a year, take everything out of the bag, and sort it into keep, replace, and discard.

Some situations call for replacing a product immediately rather than waiting for the next review. Cleveland Clinic advises replacing eye products or mascara after an infection such as pink eye or a cold sore, and replacing lip products sooner because lips carry a lot of bacteria. If you have an eye infection, a persistent skin reaction, or a suspected infection after using a cosmetic product, consult a healthcare professional rather than relying on a shelf-life guide.

• Texture changes: clumping, separating, or a gritty feel.
• Smell changes: sour, musty, chemical, or gasoline-like odors.
• Color changes: fading, darkening, or separation into layers.
• Performance changes: products that no longer blend, set, or apply as they used to.
• Known exposure: replace eye and lip products after an infection such as pink eye or a cold sore.

Sources: Cleveland Clinic (Health Essentials), New York Society of Cosmetic Chemists (NYSCC), Revlon

Cleaning brushes, sponges,

Brushes and sponges touch powder and skin every time they are used, and they accumulate product, oil, and microbes. Cleveland Clinic recommends cleaning them at least weekly, and Revlon advises keeping hands and brushes clean before dipping them into products. The AEDITION quotes makeup artist Ciucci saying that if only your own face is touched, once a week is a reasonable baseline for foundation, concealer, powder, blush, and brow brushes, and quotes Dr. Shah saying that brushes and sponges used around the eye should be cleaned every one to two weeks depending on how dirty they are. For someone at home, makeup artist Wilson recommends once a week or at minimum twice a month.

For washing, Cleveland Clinic notes that shampoo can be used to clean makeup brushes, and the brushes should be allowed to air-dry completely. A practitioner tutorial describes a more detailed method: rinse under lukewarm water with the bristles pointed downward, work in a gentle cleanser, rinse until the water runs completely clear, gently squeeze, reshape, and lay the brush down to dry. The same tutorial warns that water should be kept away from the ferrule, the metal section that holds the bristles in place, because too much moisture around the ferrule can loosen the glue and damage the brush over time. That ferrule warning is practical guidance from a working makeup artist rather than a regulated rule.

Sponges need the same attention. The practitioner tutorial describes saturating a sponge under running water, working in baby shampoo, and squeezing and rinsing repeatedly until the water runs clear, then drying it next to the brushes. A separate low-authority source also suggests soaking sponges in warm water with gentle soap, squeezing and massaging them, and rinsing thoroughly. That source additionally mentions microwaving a damp sponge for about 30 seconds as a deep-cleaning step, provided the sponge is wet to avoid a fire hazard, but this is a single-source suggestion and is not confirmed by the higher-authority sources here. If you are unsure, stick to washing and air-drying.

Beyond brushes, the New York Society of Cosmetic Chemists recommends cleaning the inside of nozzles, eyeliner tips, and eye pencil sharpeners, and wiping out makeup kits, boxes, drawers, and compartments regularly with a cleansing wipe. Sharpen pencils before use so the tip is clean, and wipe the outside of compacts and tubes when you do your six-month review.

1. Wet the bristles with lukewarm water, keeping the ferrule out of the stream.
2. Apply a small amount of gentle cleanser or shampoo and work it through the bristles with your fingers.
3. Rinse until the water runs completely clear.
4. Gently squeeze excess water out and reshape the bristles.
5. Lay the brush flat to air-dry completely, angled slightly downward if possible.
6. For sponges, saturate, work in gentle soap, squeeze, and rinse repeatedly until the water runs clear, then air-dry.
7. Wipe down handles, sharpener blades, and the inside of storage compartments with a cleansing wipe.

Sources: Cleveland Clinic (Health Essentials), New York Society of Cosmetic Chemists (NYSCC), The AEDITION, Glam Girl Gabi (YouTube), Ask the Bests

Storing makeup to reduce contamination

Storage is one of the few variables you can control directly. Revlon advises storing makeup in a cool, dry place, avoiding bathroom humidity and direct sunlight, closing lids tightly after each use, and keeping hands and brushes clean before dipping into products. Real Simple, citing cosmetic chemist Ron Robinson, gives similar advice: store makeup in a cool, dark, dry environment, avoid a warm, damp bathroom, and keep products in their original box to limit exposure to sunlight, heat, and air. The New York Society of Cosmetic Chemists adds that bacteria thrive best in warm, moist environments and grow fastest between 41 and 135 degrees Fahrenheit, so a clean, dry place away from direct sunlight and moisture helps limit growth. That temperature range describes where bacteria generally grow fastest; it is not a recommended storage setpoint.

For a small beginner kit, the practical version is to keep the daily bag out of direct sun, avoid leaving it in a hot car, close every lid and compact after use, and store brushes upright in a clean container or in a case so the bristles are not crushed or exposed to dust. If a product comes with a small spatula or applicator, use it instead of fingers where possible, since dipping fingers into creams introduces bacteria and fungi with every use.

• Keep makeup cool, dry, and out of direct sunlight.
• Avoid storing the daily bag in a humid bathroom or a hot car.
• Close lids and compacts tightly after every use.
• Use the provided spatula or applicator rather than fingers where possible.
• Store brushes upright in a clean, ventilated container or in a dedicated case.

Sources: New York Society of Cosmetic Chemists (NYSCC), Revlon, Real Simple, Ask the Bests

Sharing products and testers: what to avoid

Sharing makeup is one of the fastest ways to transfer microbes between people. Revlon specifically advises avoiding sharing makeup, especially eye and lip products, and the New York Society of Cosmetic Chemists describes how every dip of a finger or applicator exposes a product to bacteria and fungi. For a beginner kit, the simplest rule is to treat eye and lip products as personal items and not to lend or borrow them.

It is also worth knowing how common contamination is. Cleveland Clinic reports that one study found 90 percent of used makeup products contain an abundance of bacteria, including E. coli. That figure is reported as the source states it; the original study was not reviewed here, and the exact methodology is not part of this guide. What that finding supports is a practical habit: keep your own products clean, replace them on a sensible schedule, and do not share the items that touch your eyes or lips.

In-store testers carry the same concern. Testers are handled by many people and are not cleaned between every use, so applying a tester directly to your eyes, lips, or skin is a common route for transferring microbes. If you want to sample a shade, ask for a single-use applicator or a fresh sample, or test on the back of your hand rather than on your face.

• Do not share mascara, eyeliner, lipstick, lip gloss, or lip balm.
• Avoid applying in-store testers directly to your eyes, lips, or face.
• Use a single-use applicator or a fresh sample if you want to try a shade.
• Wipe the outside of shared containers if they must be handled by more than one person.

Sources: Cleveland Clinic (Health Essentials), New York Society of Cosmetic Chemists (NYSCC), Revlon