The two tone hair trend may have made dark roots in blonde hair acceptable. Not long ago, it was taboo to show hair near the roots, which had grown out in a different color. At that time these ‘roots’ had to be touched up. This forced many women to color their hair frequently. Today, the once taboo look may be considered the beginning of trendy two tone hair color styles. This ombré hair, for example, will do nicely until the next hair color treatment.
Having a relaxed attitude about such minor issues as dark roots is certainly a good idea. Being uptight has no positive returns and limits creativity!