Sometimes having naturally curly hair can be a pain, particularly in humid weather! Here is a simple tried and true tip to Straighten your Hair Naturally, without damaging heat! Simply place 1/3 cup of regular milk in a spray bottle, spritz (dry) hair thoroughly, comb through, allow to set 20 minutes. Then jump in the shower, Condition lightly, towel dry, comb out and voila! Straight Hair! You will find that your hair is very straight and silky.