Greasy roots have finally met their match. Fekkai’s treatment contains antibacterial and antifungal apple cider vinegar, an astringent that removes oil to prevent scalp acne and flakes between washes.

Dandruff is more than just a minor inconvenience. It can be itchy, embarrassing, and frustratingly persistent. But what if the solution doesn’t lie in harsh shampoos or expensive products? What if ...