Five ways to get straight hair naturally

Coconut and Lemon
 Add a few drops of lemon juice to freshly prepared coconut milk and mix well. Keep the glass of coconut milk and lemon juice into refrigerator for a few hours. A thick foamy layer will appear over the glass, which needs to be applied on the scalp and entire length of the hair right away. Steam your hair for 15-20 minutes after this and follow it up with a wash. Repeat this process regularly to get straighter hair.
Celery
Crush a few fresh celery leaves and mix them with a little water. Squeeze it to extract the juice and store it in bottle. The bottle has to be left unused for at least a day, so as to allow the juice to develop properties and effectiveness for straightening. Using them regularly, preferably in the morning, before bath will help in straightening hair. Massage it well on the scalp and leave it for 15-30 minutes, prior to washing it off with a shampoo.
The Milky Way
Milk is known to have moisturizing properties, which are suitable in straightening the hair. Take half cup of milk, preferably boiled and cooled. Then mix it with half cup of water. Store it in a spray bottle and spray over the hair. Allow it to stand for half an hour, before shampooing the hair. This mixture will help in straightening as well as adding substantial amount of moisture to add smoothness to the hair.
Cast a Spell with Castor
Castor oil is known to have hair growth and hair straightening properties. Massage the oil on the scalp, along your hair strands and then comb your hair properly. As you comb, blow dry your hair, which has been separated into sections, on high heat. The hair should feel dry and not oily after being blow dried. When done, wrap it with a chilled towel and leave for half an hour. It will soothe the hair from excessive heat and will restore the straightness.
Hair Dryer and Hair Brush
This combination is something that people have seen in salons and spas. This can be done at home too! Get a hair dryer and a good hair brush, which will stretch and hold your hair firmly in place. Comb your wet hair and while it is still wet, use hair brush to stretch a section of hair by rolling it in end and then blow dry it. Repeat the process for other sections of wet hair till dry.