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How Japanese Straightening Treatments Work
Japanese straightening treatments can take several hours, and involve chemically relaxing the hair using a calcium-based hydroxide solution, or a lye based solution. The hair is washed with a clarifying shampoo, and the straightening treatment is applied to the scalp and all the strands. After the solution is rinsed out, the hair is blow-dried and flat ironed until it is very straight and smooth. In some cases, the straightening solution is applied again, rinsed out, and the hair is flat ironed until it is very straight. In order to maximize results, you cannot wash your hair for about *2 hours after the treatment.

The Japanese hair straightening treatment does change the structure of the hair and can cause damage to weak strands. You will need a professional consultation before undergoing this type of intensive hair straightening treatment.