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<li style="text-align: justify">Question: [Thursday, 28th Tamuz 5781]</li>
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Am I allowed to dye my hair during the three weeks?
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Answer:
Yes. However, some avoid doing so from the start of the 9 days.
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Explanation: There is no recorded restriction against dyeing hair throughout the three weeks, nonetheless some avoid doing so during the nine days being that some are accustomed to diminish in jewelry and makeup during this time, even though that from the letter of the law it is permitted.
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Sources: See regarding diminishing in makeup during the nine days: Ashel Avraham Butchach 551

Shulchan Aruch HaRav | From the Rav’s Desk: Dyeing hair during three weeks

Question: [Thursday, 28th Tamuz 5781] Am I allowed to dye my hair during the three weeks? Answer: Yes. However, some avoid doing so from the start of the 9 days. Explanation: There is no recorded restriction against dyeing hair throughout the three weeks, nonetheless some avoid doing so