If you showered yesterday, you should probably skip it today. A growing body of evidence suggests that showering too much can mess with your skin and dry out your hair, since it can wash away many of the naturally occurring but beneficial bacteria and oil that keep skin and hair healthy.
"It's paradoxical, but people who wash their hair a lot to get rid of oil are drying out their scalp and producing more oil," Lynne Goldberg, a dermatologist and the director of Boston Medical Center's hair clinic, told Business Insider.
When it comes to setting up your own regimen, consider two things: the average dryness of your skin and scalp, and the texture of your hair. If they are neither very oily nor very dry, you likely only need to bathe once or twice a week. If your hair is curly and thick, you may need to wash it even less frequently, since coarse hair slows down the spread of oil from your roots through the length of your hair.