National Olaplex Day is celebrated annually on June 25, primarily in the United States, to honor the innovative hair treatment known for its ability to strengthen and repair hair from within. The day encourages individuals to explore the science behind healthier hair and to engage with the Olaplex product line. Common customs include treating hair to Olaplex treatments, either at home or in professional salons, and sharing hair transformation experiences on social media platforms like Instagram and TikTok using the hashtag #NationalOlaplexDay. Beauty retailers and salons often participate by offering special promotions and discounts on Olaplex products and services, making it a day for both celebration and beauty deals. The holiday highlights the brand's patented bond-building technology, which has revolutionized hair care since its inception.