Beauty products do have a shelf life. Here's a quick guide on the shelf lives of typical beauty products. We've listed them in alphabetical order. Oh, and just one quick little "PS": Please keep in mind that these are estimates.

• Brushes- Wash every 2-3 months
• Cream and Gel Cleansers- 1 year
• Concealer- up to 12 months
• Eye shadow- up to 3 years
• Foundation- Water based, 12 months; Oil based, 18 months
• Lip Liner – 3 years
• Lipstick- 1-2 years
• Mascara- expires fastest, 4 months
• Nail Polish- 1 year
• Pencil eye liner- up to 3 years (sharpen regularly)
• Powder- 2 years
• Sponges- Wash weekly and discard monthly