I don't think that I have seborrheic dermatitis. But still I have lot of dandruff since very long period and sometime ago I had approached to doctor also, he had prescribed me a denfast shampoo which consists of ketoconazole along with zpto, I have seen a bit of change by using denfast shampoo, but still my dandruff has not gone completely and due to dandruff I am having hair fall problem. So, can I try 8x shampoo instead of denfast?