Could shampoo be a thing of the ? Millions of us spend a lot of  and money on it, but is it ? Shampoo sales have gone down a  in the UK recently as more people are changing their hair-washing . A recent study by Nielsen, a consumer  company, said: "People are working from home…and  people are smoking, so [they] are using less shampoo less  than before." The ecosalon.com website said shampooing regularly may be the reason hair gets so greasy. Shampoo makes the scalp , so the head produces more oil, which you then shampoo again to remove. The site said: "By shampooing less often, your  naturally reduces its production of [oil]."
However, many people say shampoo is  for the hair. Mark Coray, a former president of the National Hairdressers' Federation in the UK, says there is no  to not washing your hair. He said: "Shampoo is not abrasive or  to the scalp….The  in shampoo help the hair to look so [glossy]….The hair's oil may build up so it starts to look like it is ...but it will not self-clean." A hair loss  in London, The Belgravia Centre, said: "Rinsing your hair is not going to be very  after certain activities that make the scalp , such as exercising or using a sauna." It added: "Rinsing will also not remove  or clean the  oil from your scalp if you have greasy hair."