I have been a bottle blonde for 30 years. I decided that I wanted to get my hair colored to match my roots and had blonde highlights added. My roots are not growing in and I want to go all blonde again. Can I just use my regular hair dye? I don't want to strip it because I have very coarse, thick, curly and chemically straightened hair. Most of the brown has faded out, so I don't really think I need to strip it. Can anyone tell me how to go back to blonde without killing my hair?