Shiny frizz-free hair, right this way.Nicole Kidman at the 98th Annual Oscars held at Dolby Theatre on March 15, 2026 in Hollywood, California.Credit: JC Olivera / WWD via Getty ImagesThe GistA Brazilian blowout is a professional salon treatment designed to smooth frizz, enhance shine, and make hair more manageable.The treatment works by coating the hair with a keratin-based formula that is sealed in with heat to create and preserve a smoother a…