A regular customer recently told me about a friend who goes weeks without shampooing her hair. She, the friend, believes that substituting dry shampoo is easier and, since she gets a weekly blow dry, the styling lasts longer. She’s not alone.It’s become a kind of trend.

Spring brings all kinds of new trends in hair care. Some people have substituted a water rinse or conditioner for shampoo. This trend is fueled by a belief that shampooing is bad and that your hair will be healthier and shinier by letting its natural oils do the work. That is not entirely true. You may actually do more harm and have fewer benefits than you think.

When guys come to my salon for a haircut, they start out with the usual treatment – luxurious shampoo and scalp massage. I don’t know if that service is the trigger, but the next question frequently asked is, “How often should I be washing my hair?”