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Flat irons, also known as hair straighteners, are electrical devices used in hair care to transform curly or wavy hair into sleek and smooth styles. They consist of two heated plates that clamp down on sections of hair, applying direct heat that breaks down hydrogen bonds in the hair shaft, consequently altering its natural texture. Flat irons come in various shapes, sizes, and materials such as ceramic, tourmaline, or titanium, each offering unique benefits for different hair types and conditions. They are considered a staple tool in beauty routines for achieving polished and straight hairstyles.