Re: White stuff in hair even after I shampoo?I agree about the dry scalp. I have that problem and have to use a moisturizer on my scalp; I like Elasta's Mango Butter, it's for the hair but my scalp likes it. I also love Proclaim's Natural 7 oil, it is awesome for the hair, scalp, body, make up removal, hot oil hair treatments and it's only about 3-4 bucks.
Are your lips dry and cracked? That would give a hint as to what's going on with your scalp.
I also have issues with mild Seborrhoreic dermatitis, which is a stronger dandruff that causes thick dry patches on the scalp (it can be anywhere but for me it is the scalp) that can flake in either large flakes or tiny ones; I use both Head and Shoulders Intensive treatment and also a prescription Ketoconazole shampoo every now and then when the Head and Shoulders isn't enough (generally a severe change in humidity will cause the yeast- the cause for dandruff to act up quickly). I haven't had to use the prescription that often though, because I take pre-emptive action- I've had that shampoo for over a year.
I would suggest go the simplest route first- a basic scalp moisturizer like mango butter or coconut oil (natural, unrefined- that is very important) or the Proclaim as it's all natural- no mineral oil or if you get something that has it in it, not in the top ingredients and then work you way up if you need to.
And drink lot's of water!!!! If you are dehydrated, your skin will flake and the scalp is always what will react first. Remember, by the time you are thirsty, you are already dehydrated.