What is the ruling on using black henna to straighten frizzy hair as a treatment?
The meaning of "black henna" is not clear to us, but the basic ruling is that it is permissible for a woman to treat her frizzy hair and to dye it with henna, except that dyeing with black color is forbidden.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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