If you have dry and/or curly hair, you lucky lady, you don't have to wash your hair every day and quite frankly, you shouldn't (it's very likely you know this already). A basic rule of thumb for you is to shampoo twice a week with moisturizing shampoo and conditioner. If you have normal hair (and I know of no one who thinks they have normal hair), you can wash your hair up to five times a week or as needed. You might find you need to wash hair more times in summer when you're more active (unless you're a skiing fanatic, in which case I say just wear a hat). As for those of us with oily hair (me, me!), contrary to wisdom you may have read in Seventeen magazine in your youth, you can wash hair daily. Skipping a few days is not going to magically turn your limp locks into full body wonder. Unless you soak up the oils with baby powder or a dry shampoo, your hair will resemble the inside of a deep fat fryer.