My hair is very dry and very rough and white.

There are several good ways to smoothen dry rough hair, one by one or all together: a

it might be the kind os shampoo and conditioner u are using

if u use the same kind for long periods of time u can get to much of some nutrients and not enough of others 

also check out your diet!

thats a big part of it as wellif u arent getting the right foods in your system no matter what u do your hair will be dryd out and rough.

try taking a multi vitamin and using a different shampoo and conditioner and look for something for scalp and root therapy

i find it helps to comb through conditioner when washing and leave it on for a few minutes.

also you can use hair oils which are good and products like hair serum.

If none of those work you should check your diet and maybe buy multi vitamins or hair and nail vitamins.

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Put a half cup of real mayonaise on slightly dammpened hair  cover with plastic bag or shower cap  leave on half hour rinse and shampoo  the mayo will soften dry hair and helps dammaged hair   u will see a change