Hair Smoothening is not easy to manage. Especially when you have beautiful curls that poof up as soon as you take a brush to them. While a solid hair care routine does help to some extent, not everyone finds enough time to pamper their hair with oil massages and hair masks. That is why there are treatments like hair smoothing and hair straightening that help transform the structure of your hair, making it more manageable. While both these treatments result in sleeker hair, there is a slight difference between the two.