From a Hairstylist
"If you have an oily scalp, washing your hair every day can be good for it, especially if you have fine, straight, wavy, or curly hair and you are seeking volume and lift at the root," said Mancuso. "If your hair is very curly to 4c, daily washing may not be practical if your styling requirements are laborious. In this case, I suggest washing as frequently as you can (every two weeks should do). If you have a dry scalp, this doesn't necessarily mean you get a free pass to a filthy scalp, but I have many clients whose hair looks amazing after three days and beyond."