This listing is for (1) Bottle. DHS SAL Shampoo is a maximum strength treatment recommended by physicians to control crust scalp build-up while relieving itching and flaking from severe scalp conditions. It contains Salicylic Acid, which is clinically proven to be effective in breaking down crusty, flaky build-up and continues its benefits hours after the shampoo is rinsed off. Treats crust scalp build-up from Psorasis, dandruff and Sebhorreic Dermatitis Relieves itching and flaking from severe scalp conditions Salicylic Acid is clinically proven to be effective in breaking down crusty, flaky build-up Keeps working even after you wash it off For best results use at least twice a week or as directed by a physician