Not washing you’re hair for several weeks or months, regardless of ethnicity, is not great hygiene. After a while with product build up, dirt, dust, and who knows what else, your hair starts to smell and look dull. If you have dry scalp, dandruff, psoriasis, or any scalp issues, lack of shampooing can lead to hair loss and/or scalp infection. Some ethnicities need to shampoo their hair daily, and some weekly. Which ever ethnicity you are, I would suggest not going past 7-10 days between shampoos. So stay clean folks!