Follow these steps:
After getting out of the shower do not apply any styling products
Allow hair to air dry with minimal effort, i.e. brushing through
Feel the texture of the hair once dried.
Once your hair is dry and you try to brush through it, you will notice that your hair is protein sensitive if you experience breakage and/or split ends. Also, if your hair feels hard, rough, or dehydrated, it’s likely that your hair has been exposed to too much protein, resulting in damage to your hair.