Without color; lacking characteristics which give variety. blank (Adjective). Free from writing, printing, or marks; having an empty space to be filled in; as, blank paper; a blank check; a blank ballot. blank (Adjective). Without expression.
Yes they do damage hair. Every time I have tried one ,I wound up looking like a Q-tip or my head looked like cotton. A perm will damage even more and look worse if you have been coloring your hair. There's chance of it looking okay if you don't color your hair.
Adding a few highlights might be better than a total bleach out on your entire head of hair. Keep in mind that bleach and perm solutions are strong chemicals that open and swell your hair cuticle. The more you swell the cuticle, the more rough and frizzy it can appear.