Think of a deep conditioner as a maintenance product that helps keep your hair in its best shape. These are conditioners that prevent your hair from getting too dry, and they help to improve the overall health of the hair by making sure it stays hydrated. Deep conditioners are typically applied after shampooing and can be left on the hair anywhere from 15 to 30 minutes (though you can keep it on for as long as you're comfortable with).
Ideally you should try and deep condition your hair at least once a week, though some naturals incorporate this step into their routines twice a week. Ultimately, you know your hair better than anyone, so how often you choose to take this step depends on how your own hair behaves.
Keep reading for some great options to keep your curls looking nice and moisturised.