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Phenols are used to?

  1. Reduce frizz

  2. Enhance color vibrancy

  3. Disinfect surfaces

  4. Repair split ends

The correct answer is: Disinfect surfaces

Phenols are commonly used as disinfectants due to their strong antimicrobial properties. They are not typically used to reduce frizz or repair split ends in hair products. While they may have antioxidant properties, they are not specifically used to enhance color vibrancy.