Japanese hair straightening originated in Japan in the 1990’s; it became popular in the United States in New York in the early 2000's and is now widely available. The process is extensive, taking about 4 hours and can take up to 8 hours depending on the length, thickness, and condition of the hair being treated. The hair type that will benefit the most from this procedure is medium to loose curls or wavy hair; there will be less benefit for very tight curls with this procedure. Japanese hair straightening is a thermal reconditioning and unpredictable for women who are pregnant or nursing. If you have recently had your hair colored, highlighted, or relaxed be sure to inform your stylist, as it will affect how the Japanese Straightener processes your hair. Touch-ups are typically needed 6-9 months later. Japanese straighteners are not compatible with hydroxide based straightening products.