In a video posted on social media, beautician Alexa Cerwick advised against washing hair every day, and preferably only twice a week. And Alexa said washing your hair with shampoo every day may do more harm than good, because shampoo can strip your scalp of all its natural oils and result in dry, brittle hair. “You have to start training your hair, this is really important for hair growth, as your hair will adapt to fewer washes and produce less grease,” she explained. “When you start taking care of your hair properly, it will not become greasy, but will…