The key is to keep the scalp clean. So if that requires daily shampooing, that's fine. 
It won't harm the hair. If your hair is dry, then most likely fewer washes will do.

Whatever the case, the shampoo you use is key.

It's critical that the shampoo you use does not contain ingredients that will not easily rinse off.
 Unfortunately, most shampoos do contain ingredients like silicones, conditioning agents, thickening resins that coat the hair and scalp, which dulls, weighs hair down and much worse, can even impede new hair growth by blocking the follicles.
We strongly recommend Color Wow Color Security Shampoo... the first shampoo to 
eliminate these potentially harmful and totally unnecessary ingredients:
• NO sulfates
• NO silicones
• NO thickening agents

• NO conditioning agents
• NO pearlizing agents
• NO oils

These ingredients have nothing to do with cleaning; in fact they do the opposite. It’s key to use a “clean” shampoo for clean healthy hair and scalp.”

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