Which chemical ingredient is commonly found in hair straightening treatments?

Hair straightening treatments often utilize specific chemical ingredients known for their effective capabilities in altering the structure of hair. Sodium hydroxide and ammonium thioglycolate are the primary agents used in these treatments.

Sodium hydroxide, also referred to as lye, works by breaking down the protein bonds in the hair, which allows the hair to be reshaped into a straighter configuration. This is particularly effective for coarse or curly hair types that require intense treatment to achieve the desired sleek look.

Ammonium thioglycolate serves a similar purpose, being a milder alternative to sodium hydroxide. It is commonly found in 'perm' solutions but is also used in straightening treatments due to its ability to break sulfur bonds in the hair. This approach allows for the restructuring of hair without the potency and harsher effects often associated with sodium hydroxide.

The other options, while relevant to various sectors of cosmetology, do not serve as the main ingredients for hair straightening. Hydrogen peroxide, for example, is often utilized in hair bleaching and coloring processes rather than straightening. Isopropyl alcohol is typically found in sanitizers and cleaning products and does not have a role in hair structure alteration. Dimethicone is a silicone-based compound often