When should you replace pillows, toothbrush & other items?

Most everything you own -- computers, pillows, smoke alarms, even
makeup -- eventually wears out. Here's the life expectancy of some
common household items.

Nothing lasts forever. That said, many items are less obvious than
the spoiled milk in your fridge; there's no expiration date or other
obvious signs they have outlived their usefulness.

So how long
should you let your stuff linger before replacing it? We talked to the
experts and nailed down a "best by" date for a number of common
househol