Adults and children over 12 years: Wet hair, apply 1 to 2 teaspoons of shampoo and lather, leaving on hair for 3 to 5 minutes. Rinse thoroughly. Use twice a week for 2 to 4 weeks to eliminate dandruff. Thereafter, use once every 1 to 2 weeks to prevent dandruff from recurring. For children under 12 years consult a doctor.