National Dry Shampoo Day is celebrated on the second Sunday in March, primarily in the United States, to honor the convenience and effectiveness of dry shampoo as a hair care solution. This day highlights how dry shampoo serves as a quick fix for those who may not have time to wash their hair, helping individuals feel fresh and confident. Observers often share styling tips, tutorials, and product recommendations online, while also acknowledging the historical roots of dry shampoo, which date back to the 15th century when clay was used in Asia to refresh hair. The holiday was established by Klorane in 2017, promoting dry shampoo as a "secret weapon" against oily or frizzy hair between washes. Participants may also explore eco-friendly alternatives and engage with the hashtag #NationalDryShampooDay on social media.