If you have sensitive, chemically treated hair make sure to go in for a consultation with your stylist before you decide to take the perm-plunge. Women with fine coloured hair that has been frequently heat styled (blow-dry, straightening iron etc) will find that, in many cases, the hair is too fragile to take to full concentration of perm solution. But that is not to say that all is lost, and that the digital perm cannot be done. What the stylist will do is take a test sample of your hair and apply the perm solution to see how it will behave. If it receives a passing grade, then you can go ahead and, with the lowest concentration of chemicals, achieve the loose waves of your dreams. A digital perm is definitely not as harsh on your hair as the old-school perm your grandmother used to get.