Chill & Kill Leave-in Formula Kills Dandruff. Relieves Itching. For clean and dandruff-free hair. Unlike shampoos that rinse away, the anti-dandruff tonic is a leave-in product. It prevents flakes from forming and helps eliminate the symptoms of dandruff. The deep penetrating formula also relieves itching and soothes irritated scalp. Apply directly to the scalp. Massage gently with circular movements. Do NOT rinse out. Style as usual. Combine with Anti-Dandruff Shampoo for maximum effect.