What is a hair treatment that uses heat to straighten hair called?

The correct answer is a keratin treatment, which is a specialized hair treatment that uses heat to deliver a smoothing and straightening effect on the hair. Keratin, a protein naturally found in hair, is infused into the hair strands and then sealed in with heat, usually applied through a flat iron. This process helps to reduce frizz and make hair more manageable while enhancing its shine and smoothness.

Keratin treatments are particularly popular for individuals seeking a long-lasting straightening solution, as the effects can last for several weeks to months, depending on hair type and care routine following the treatment. The controlled application of heat during this process ensures that the keratin penetrates the hair effectively, leading to the desired straightening effect.

Other methods mentioned, such as hair relaxers, are also used to straighten hair but typically involve chemical processes rather than primarily relying on heat. Cold perms, on the other hand, are used to curl hair without heat and deep conditioning treatments are used to restore moisture and repair damage to the hair while not focusing on straightening.