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When performing a permanent wave, when is the piggy-back technique useful?

  1. On short hair

  2. On medium hair

  3. On long hair

  4. On damaged hair

The correct answer is: On long hair

The piggy-back technique in a permanent wave is a method of wrapping the hair using two rods stacked on top of each other. This allows for a tighter and more controlled curl pattern. While it may be suitable for all hair lengths, it is specifically helpful for longer hair as the added weight and length can make it more difficult to achieve a uniform curl pattern with a traditional wrap. This technique is not necessarily needed for short or medium hair, as they are easier to wrap and style with standard methods. Additionally, using the piggy-back technique on damaged hair may cause further damage, so it is not recommended for that hair type.