Hi, for the past two months my daughter and I all of a sudden got extremely dry scalp. we have tried everything. At first, I taught it was lice and I applied lice shampoo to both of our heads. That did not work, so next I tried apple cider vinegar, natural drandruff shampoo, head n shulders,, expensive shampoo from the salon, I don't know what else to do. Our heads itch all the time. It looks like we have dandruff all thru our heads, alot!!!!!