Compared to the leading medicated shampoo-Denorex is extra-strong. It has 50% more of a doctor recommended scalp medication for problems like dandruff, seborrhea psoriasis. You can feel Denorex tingle as it works to relieve itching, control flaking and scaling.
Use Denorex for your next shampoo. Then try the fingernail test again. You'll see-Denorex cleans away dandruff like nothing you ever felt before.