Lemon is a natural and a great way to cure dandruff. Simply just squeeze a fresh lemon, massage a few tablespoons of juice into your scalp, and rinse with water. Repeat weekly until the dandruff is gone. This remedy works in essentially the same way as apple cider vinegar. The skin of the scalp is slightly acidic, with a pH of about 5.4 but it can be more alkaline from either hair products or its own secretions. Bringing it back to its normal acidity helping to relieve the dandruff.