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Dandruff usually comes with visible flaking, while dry scalp causes itching without the same flake buildup. A medicated anti-dandruff shampoo targets the flaking directly; a calming tonic is better suited to itching without flakes.

Common causes include dryness, product buildup, sensitivity to a new formula, or dandruff. If flaking is present, treat it as dandruff first — if not, a calming tonic is the better starting point.

Three months minimum, since that's roughly the hair growth cycle. Anything promising results within two weeks is describing reduced breakage, not new growth.

Yes, occasionally — a scalp scrub clears buildup that a shampoo alone can leave behind, which supports everything else in your routine working as intended.