According to a Hairstylist
Of course, there's the matter of how clean you want your hair to be. "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 Kevin Mancuso, hairstylist and global creative director for Nexxus. These hair types can usually go a few days without washing when not exposed to the elements. "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."
"We know that viruses can live off of the body for hours or even up two days."
For Dr. Zeichner, it's just as important to wash your hair as it is your body should you venture outside. "The oily environment of your scalp and hair could theoretically serve as a reservoir for the coronavirus," he said. "We know that viruses can live off of the body for hours or even up two days. In cases like this, dry shampoo will not take the place of traditional hair washing."