Best shampoo for toddler with dry scalp? My girls scratch alot. They dont have lice and I've checked…

Best shampoo for toddler with dry scalp? My girls scratch alot. They dont have lice and I've checked many times out of paranoia. You can see the dandruff in their hair. I used a small amount of dandruff on my 2 year old once and she didn't scratch for DAYS. But it's so strong and burns so bad if even the tiniest drop gets in your eyes. What's an alternative for tots?