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Permanent waves or chemical hair relaxers are required to break what?

  1. A small involuntary muscle attached to the inner side of a follicle

  2. Hydrogen bonds

  3. Cuticle layer

  4. Sulphur bonds

The correct answer is: Sulphur bonds

Human hair contains disulphide bonds which are a type of chemical bond between two sulfur atoms. Chemical hair relaxers break these bonds in order to help temporarily straighten curly or wavy hair. Hydrogen bonds and the cuticle layer are also involved in the process, but they are not the primary bonds that are broken. A small involuntary muscle attached to the inner side of a follicle is not involved in the process of breaking bonds for chemical hair relaxers, and is therefore an incorrect option.