Dr. Liu warns against infrequent hair washing on TikTok, explaining it can lead to sebum build-up, dandruff, and inflammation.

Dr. Jenny Liu, a board-certified dermatologist, warns against neglecting hair washing on TikTok, saying "never go more than a few days" without washing your hair. She debunks the myth that hair and scalp cleanse themselves and explains that sebum and dead skin build-up can lead to Malassezia yeast overgrowth, causing dandruff and inflammation. Regular hair washing is essential for scalp care, Dr. Liu emphasizes.