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Keep an Eye on It

Never take chances with anything used close to your eyes, such as mascara or eyeliner; replace each item every three months.

 One-Year Plan

Products applied directly to your skin that have a liquid or cream consistency (foundation, concealer, cream eye shadow and blush, lipstick, moisturizer, eye cream) will last up to a year.

 Life Expectancy

Powders (face powder, blush, eye shadow), which contain fewer oils than their creamy counterparts, can be used 1 to 2 years.

 Warning Signs

Pay attention to moisture beading, color separating, a change in the original color, or a foul smell. These are all warning signs that the preservatives in the product may have broken down. Be especially vigilant about natural and organic products as they contain nontraditional preservatives, which can affect their shelf life.

 Just for You

Keep your makeup (especially anything you use near your eyes) to yourself. Don’t share your products — and your germs.

 Know When to Toss

Don’t add water or saliva (yuck!) to thin out the texture of a product that’s begun to clump. Throw it away and buy a replacement.

 Tools of the Trade

Avoid dipping your finger (and introducing bacteria) into open containers. Use applicators or disposable cotton swabs instead.

 Keep it Clean

Regularly cleanse brushes, tools, and sponges that can trap oil and bacteria. Wash with mild soap or baby shampoo semiweekly and toss sponges after several uses.

 Pump it Up

Take note of creams in open pots, which are less stable than those with an enclosed pump, which keeps them fresher longer.

 Play it Safe with Sunscreen

“The FDA requires sunscreens to remain stable and effective on the self for 3 years from the date of manufacture, and a year after the tube has been opened,” says Los Angeles dermatologist, Ronald Moy. If your sunscreen has expired, pitch it.