Both my daughters suffer with a very dry scalp/dandruff. They're aged 9 and almost 13. The eldest gets especially bad flaking before her period (huge flakes!) Is there any brand of dandruff shampoo you can recommend for children? I've tried milder shampoos like E45 shampoo and it's not worked. I guess my eldest could use any anti dandruff shampoo, but wasn't sure about my youngest!