This procedure is called HAIR REBONDING. It will keep your hair straight all throughout but it needs to be redon at least once a year for the new growing hair. It will keep hair shiny and no need to put your hair through harmful ironing everyday. The price ranges according to the hair length. The time it takes may vary from 4 to 12 hours for the whole process to be complete and again, still depending on your hair length and texture and quality.