A hair moisturizer is designed to maintain the moisture level in your hair strand, and should if your moisture level is low. The best way to know if your moisture level is low is quite simple—inspect your hair. If your hair feels dry, hard, and brittle, then it needs moisture. Apply Moisture Plus Moisturizer, a small amount at a time, until the hair begins to soften. When it reaches that point, then your moisture level is where it needs to be.