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What is the primary purpose of a dry shampoo?

  1. To add volume to hair

  2. To cleanse the hair without soap and water

  3. To colour the hair

  4. To straighten the hair

The correct answer is: To cleanse the hair without soap and water

Dry shampoo's primary purpose is to cleanse the hair without using water or soap. Option A, adding volume, is not the primary purpose as it is just an added benefit. Option C, coloring the hair, is incorrect as dry shampoo does not contain any coloring additives. Option D, straightening the hair, is also not the primary purpose as dry shampoo is not designed to alter the hair's natural texture or shape.