Only use wire brushes on your dolls hair.
Don't leave your doll outside for too long, if you do they could melt.
Don't wet your doll's eyes, they are hand painted.
Don't cut their hair.
Don't wash their hair too much, it weakens the hair.
If the hair is tangled, spray it with water or wipe with a wet washcloth.
For more tips go to http://store.americangirl.com/agshop/static/dollcare.jsp
If you yourself cant fix it go to http://store.americangirl.com/agshop/static/dollHospital.jsp