If your hair is exceptionally dry I would recommend a hot oil treatment. Although the oil is warm and not really hot, it is an intense conditioning for severely dry hair and it always bring my hair back to life after being over treated.
I would recommend having it trimmed regularly, not washing it daily, and using the product "it's a 10" leave in treatment. That saved my hair. It took a while to become healthy again but it is now. Also, watch your use of chemical treatments such as color and how much you heat style it. :)