Highlights can be very tricky to work with.
When hair is highlighted, some hair is lightened right next to hair that is not lightened.  Therefore the hair may process fast where highlights are present and need much more time where the hair is dark and unprocessed.  So in order not to over process the light hair, the solution should be rinsed out and the darker, healthier hair my not take. But don’t give up yet.  When Japanese hair straightening is done using high end products by certified stylists, safely improves the texture of hair by loosening and reshaping the hair's cystine protein bonds.
A prior consultation with our stylist is necessary to determine if hair straightening will be a good choice for those with highlighted hair.