The real risks of daily hair washing according to expertsHow often should you wash your hair? Scientific observation of more than 1,500 people found that regular cleansing reduced surface sebum and flaking without damaging the hair shaft. Ru that daily washing is not inherently harmful, especially for oily scalps. Short hair loses volume faster than long hair; curls tend to stay fresh at the roots longer because of their structure. Cosmetic chemist Alina Chernova emphasized that thorough rinsing is critical when you wash daily; residue from cleansers or styling products can trigger contact dermatitis and itching.