The professional Brazilian keratin treatment gives your hair a fabulous gleaming texture. However, when you wash it a few times, it can look damaged and dry. This all can lead to the deterioration of hair texture.
Everything depends on the type of the used solution, iron temperature and natural hair texture. While a gorgeous and frizz-free hair has been reported after 6-8 months by some people, the others may feel their hair has become easier to break and worse after a month of treatment.
The main reason is probably the hot iron temperature. It is known to cause breakage and damage to your hair.