For makeup tools like sponges and brushes that don't exactly have expiration dates, it can be even harder to tell when they've gone bad. Makeup sponges should be cleaned daily, but it's best to ...

Even infrequently used foundations, moisturizers, and eye makeup that you thought could last forever can (and eventually will) expire. In some cases, cosmetics might even go bad before the ...

Is it really that bad to continue using old makeup? Here's what the experts think — and their answers might surprise you.