Myth No. 1: "You shouldn't wash your hair every day"

Your mom, your friends, and even your hairstylist have probably told you that washing your hair every day is bad. Turns out, shampoo frequency really depends on your hair and scalp -- and your personal preference.

In fact, washing your hair every day can be good for you. It "helps keep the scalp clean, eliminates oil and build up, and keeps [hair] follicles breathing," says Christian Serafini, Master Stylist at Rossano Ferretti Hair Spa in Beverly Hills, Calif. The most important thing is to use a shampoo that's right for your hair, he says. One that's too harsh will dry out your scalp and hair and make daily washing impossible.