DIY Doll and Barbie Hair Repair! All you need is a spray bottle and fabric softener. I used Downy. Simply fill the spray bottle with 1/2 fabric softener and 1/2 water and spray your dolls hair and comb through. When it dries, it is so shiny too!
Monster High hair repair without re-rooting!
Here's a wonderful site with tons of information on dolls. Includes profiles on many dolls and a great deal on info on restoration.
Hot Head Microwavable Deep Conditioning Heat Cap - Hair Repair Treatment for Dry Hair, Split Ends - Purple Haze Reversible by ThermalHairCare on Etsy https://www.etsy.com/listing/181730764/hot-head-microwavable-deep-conditioning