To deep condition hair, apply a thick conditioner specially designed for deep conditioning, let it saturate the hair, apply heat and rinse. Deep conditioners are not the same as regular after-shampoo conditioners, as they often contain protein and additional moisturizing elements, such as olive oil.
The first step is to thoroughly cleanse the hair. Detangling hair after washing isn't necessary, as the conditioner softens the hair and makes subsequent detangling easier.
Generously apply the deep conditioner to the hair, then cover it with a plastic cap for the period of time specified by the directions. This can be as little as half an hour with the help of a hair dryer or as long as overnight. Completely rinse the deep conditioner out, then proceed to style hair as normal.