If you have a lot of dandruff, it might seem logical to wash your hair more frequently to keep flakes under control. However, the frequency of washing depends on your hair type, the severity of your dandruff, and the specific shampoo you're using. Here are some guidelines:

1. Use Anti-Dandruff Shampoo: Start by using an anti-dandruff shampoo as directed, which might involve daily use initially to bring dandruff under control. Follow the instructions on the product, as different formulations may have different recommendations.
2. Adjust Frequency Gradually: Once your dandruff improves, you can gradually reduce the frequency of washing. Over-washing, especially with harsh shampoos, can strip natural oils from your scalp and hair, leading to dryness and potentially worsening dandruff in the long run.
3. Consider Scalp Moisture: If you have a naturally dry scalp, washing too frequently can exacerbate dryness and dandruff. In such cases, look for a moisturizing anti-dandruff shampoo or use a conditioner after shampooing, avoiding the scalp area to prevent buildup.
4. Individual Variation: Everyone's scalp is unique, so pay attention to how your scalp and hair respond to different washing frequencies. Adjust accordingly to strike a balance between controlling dandruff and maintaining scalp health.
5. Gentle Cleansing: When washing, be gentle with your scalp to avoid irritation, which can also contribute to dandruff.

Remember, while washing your hair can help control visible flakes, addressing the underlying causes of dandruff, such as using the right shampoo, managing stress, maintaining a healthy diet, and getting adequate sleep, is equally important for long-term management. If dandruff persists despite your efforts, consult a dermatologist for further advice and possible prescription treatments.