Which product is used to neutralize hair after a perm?

The product specifically used to neutralize hair after a perm is neutralizer. After a perm, the hair's structure has been altered through a chemical process that curls or waves the hair. The neutralizer serves a critical role in this process by halting the perming process and allowing the new hair shape to set. It works by restoring the disulfide bonds in the hair that were broken during the perming solution application.

Using a neutralizer helps to stabilize the hair's new shape and aids in maintaining the integrity of the hair after the treatment. This step is essential for ensuring that the curls or waves presented by the perm remain intact and that the hair does not revert to its original state.

Conditioners, moisturizers, and heat protectors serve different purposes in hair treatment and maintenance. Conditioners are generally used to hydrate and soften the hair without specifically neutralizing the perming solution. Moisturizers provide hydration but do not address the chemical changes from a perm. Heat protectors are designed to minimize damage from styling tools but do not have a role in the perming process. Therefore, the correct choice of neutralizer is vital for ensuring the success of a perm.