If you're like many people, cleaning out your bathroom cabinet isn't high on your priority list. But experts say disposing of expired medications and products at least once a year is a good idea. A telephone survey conducted in 2005 found that one-third of the people surveyed checked the expiration date of over-the counter medications before taking them. Although not every product has to be thrown out the day it expires, manufacturers only guarantee a product's reliability until the expiration date on the label. Making sure that the products in your bathroom cabinet are still useful today may literally save you a headache later. See if you know when to replace these common items.