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Using thermal protectants before heat styling is essential because they specifically help prevent heat damage to the hair. When hair is subjected to high temperatures from styling tools, it can cause the cuticle layer to lift, leading to dryness, breakage, and overall damage. Thermal protectants create a barrier between the hair and the heat, allowing stylists and individuals to achieve their desired looks while maintaining the integrity of the hair.

Other options may have their benefits, but they do not specifically address the primary function of thermal protectants. While adding shine, enhancing natural curls, and improving color vibrancy can be positive effects of some products, the key purpose of a thermal protectant is to shield the hair from the damaging effects associated with heat styling tools.