So what does this hair care category include and what should you know before using? Don’t worry, we did the research for you. “Dry shampoo doesn’t actually clean the hair, so maintaining a proper washing routine for your hair and scalp is important for the overall health of your hair,” celebrity hairstylist Sophia Porter tells mbg about traditional dry shampoo. And relying on a rinseless option too often or for too long can not only make your hair appear dirtier, but it can do some serious damage (more on that soon). “When we have too much buildup, be it from dry shampoo or natural oils built up over a few days, the follicle opening (where each strand of hair grows out of) will become clogged, suffocated, and inflamed,” expert trichologist and hairstylist Shab Reslan explains to mbg. “Exposing your follicle to this environment frequently can affect your hair growth and possibly damage your actual follicle, leading to hair thinning over time.” The general rule of thumb is for every two dry shampoo uses, you should shampoo. Or look for any of the signs of scalp inflammation, as we explain here.