If you're using Head and Shoulders to treat dandruff, you'll usually see a reduction in symptoms within a few days. You may need to use the shampoo for several weeks to see a significant improvement.
If your dandruff is severe, you may see yellow or white flakes on your shoulders or in your hair. Head and Shoulders can help to reduce the amount of flakes and make them less visible.
If you have an itchy scalp, Head and Shoulders can help to soothe and relieve the itchiness. You may also notice that your hair is softer and shinier after using the shampoo.