Straightener No.1 Coats the entire hair evenly, except for roots and let it set at room temperature for 10 - 20 minutes. After that, rinse it sufficiently with plain water, dry the hair and set with hot straightening iron at 180°C/ 356°F. When applying, keep 1 - 2 cm above hair roots, as getting it on the scalp could cause irritation and breakage of hair. Use an intermediate water to rinse it away completely. Wash the roots carefully. Neutralizer No.2 Coat the entire hair and leave it for 20 - 30 minutes, at the same time combing it lightly. Then, completely wash it away. Complete the process. If the neutralization is not complete, it could cause damage or hair breakage, thus coat the hair sufficiently from roots to tip of hair to make sure the neutralization process is completed. There are certain do's and don's needs to be followed.