Heads and Shoulders combines a number of ingredients that specifically treat dry scalp and dandruff. Pyrithione zinc is the primary ingredient used to restore scalp health and works by reducing the amount of fungus on the scalp, the leading cause of dandruff. The shampoo also has anti-proliferative agents, such as coal tar, which slows down the production of skin cells to reduce flaking. Finally, ingredients such as sulfur and salicylic acid are keratolytic agents that break down the bonds that hold skin cells together on top of the scalp. By breaking down these bonds, the skin does not shed in clumps and less dandruff is visible.
Strong Yet Gentle
You needn't worry about Head and Shoulders being too harsh on your hair; the shampoo contains moisturizers to maintain the healthiness of your scalp and leave your hair soft and manageable. The formula is gentle enough for use on color-treated hair.
Won't Lose Effectiveness
Head and Shoulders won't lose its effectiveness over time. As long as you keep using it, you'll continue to get the same dandruff protection. However, when you stop using Head and Shoulders, the flakes will return. Malassezia, the leading cause of dandruff, is naturally occurring fungus that can be removed with Head and Shoulders treatment, but it naturally returns when you stop treating it.