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What is the pH range of hair and skin?

  1. 3.0 to 4.0

  2. 4.5 to 5.5

  3. 5.5 to 6.5

  4. 6.0 to 7.0

The correct answer is: 4.5 to 5.5

The pH range of hair and skin is slightly acidic, with a pH range of 4.5 to 5.5. This is due to the presence of natural oils, known as sebum, which help to maintain the skin's acidity and protect it from harmful bacteria. Option A (pH range of 3.0 to 4.0) is too acidic and can cause irritation and damage to the hair and skin. Option C (pH range of 5.5 to 6.5) and D (pH range of 6.0 to 7.0) are both too alkaline and can disrupt the natural balance of the skin, leading to dryness and potential skin issues. Therefore, option B is the most appropriate pH range for maintaining the health and balance of hair and skin.