بسم الله الرحمن الرحيم
Q: Is dying the beard and the hair of the head permissible, even if the intent is for beautification?
Sheikh Muhammad ibn Saalih Al Uthaymin: Dying the beard and the head black, I say that all of this is forbidden, due to the Prophet’s -sallahu alayhi wa sallam- statement, “Change this (i.e. white and or grey hair) with something, but avoid black.” Also there is a narration within the sunan, reported therein is a threat upon whomsoever dyes there white hairs with black. As for your statement, “even if the intent is for beautification” most likely the one who dyes his hair black intends beautification, in that his face remains to appear like that of the youth, and if not -i.e. for this reason- then what is the benefit in doing this? Otherwise he just wastes time, money, and actions.
Source: لقاءات الباب المفتوح
Translated by Najeeb ibn Yusuf Al Anjelesi