T/Sal Therapeutic Shampoo Scalp Build-Up Control is a dermatologist-recommended treatment to clear crusty scalp build-up while relieving itching and flaking associated with severe scalp conditions. This effective formula contains Salicylic Acid, a clinically reduce to active ingredient that breaks down crusty, flaky scalp build-up and should be used as the first step in any scalp treatment. Its clear conditioning formula is free of added color, preservatives and fragrance. Maximum relief of itchy, flaky scalp.