I have dandruff on my scalp, I've tried lots of anti dandruff shampoos such as selson,nizrol,and other antidandruff shampoos..
But these only give a relief for 2 or 3 days, but the hair keeps falling out. Again the condition worsens i have to use this again and again.
When I scratch my scalp i get white powder like thing.Everday shampooing shampooing,u feel like my scalp is getting dry day by day.
What is the reason?Which shampoo i should use?Is there any way to get rid fully?? Any advice would be help ful..please...

I think your scalp is very dry. These shampoos make your scalp more and more dry .
I heard some hair salons use some 'Astrigent' for itchy,flaky scalps .. So consult a hair expert and ask advice.