Henna and Perms
Although it’s preferable not to perm hair at all because of the strong chemical solutions which are used, you may use henna hair colour and continue to perm. However, do not use henna immediately before a perm. And wait at least two weeks after a perm before you henna - the longer the better. Always do a strand test, as advised for any chemically treated hair. Once you’re satisfied with the result you may proceed.