‘Hair training’ has become a huge trend as people try to stop their locks from getting greasy – but an expert has some bad news. The idea that you can train your hair not to get oily is actually one of the internet’s biggest myths. It’s not possible! What is ‘hair training’?Hair training is the process of slowly reducing the frequency of hair washes to stop it from getting greasy. The method suggests that you can get your scalp used to not being washed often, which will naturally reduce oil production. Instead of shampooing as soon as the hair gets greasy, you leave your locks a few days longe…