1. Breaking Disulfide Bonds:
* Hair's natural shape is largely determined by disulfide bonds. These are strong chemical links between cysteine amino acids within the hair's protein structure (keratin). Think of them as bridges holding the hair's shape together.
* Perm lotion (typically containing ammonium thioglycolate) is a reducing agent. Its primary job is to break these disulfide bonds. This effectively softens and weakens the hair, allowing it to be molded into a new shape.
2. Reforming the Hair Around a Rod:
* While the disulfide bonds are broken, the hair is wrapped around perm rods. The size and shape of the rods determine the curl pattern.
* The softened and pliable hair now conforms to the shape of the rod.
3. Neutralization (Oxidation):
* After the perm lotion has processed for the appropriate time, it's rinsed out thoroughly.
* A neutralizing solution (typically hydrogen peroxide) is then applied. This solution does the opposite of the perm lotion; it's an oxidizing agent.
* The neutralizer rebuilds and reforms the disulfide bonds in the hair, but *in the new, curled position* around the rod. It "locks in" the new shape.
In summary, perm lotion:
* Softens and weakens the hair: By breaking disulfide bonds.
* Allows hair to be reshaped: Around perm rods.
* Leaves the hair more porous: the chemical process can disrupt the hair's cuticle.
Effects on Hair Quality:
While perms can create beautiful curls or waves, they also have potential effects on hair health:
* Damage: The chemical process, especially if done improperly or too frequently, can cause dryness, breakage, and split ends. Overprocessing can lead to severe damage.
* Increased Porosity: Perms make the hair more porous, meaning it absorbs moisture (and loses it) more readily. This can lead to dryness and frizz.
* Altered Texture: Even if the hair appears healthy, the texture might feel different after a perm. It can be coarser or more brittle.
* Scalp Irritation: The chemicals can sometimes irritate the scalp, especially if the person has sensitive skin.
Important Considerations:
* Professional Application: It's best to get a perm done by a qualified professional who can assess your hair type and condition, and use appropriate products and techniques.
* Hair Type: Certain hair types are more prone to damage from perms than others. Fine or damaged hair may not be suitable for perming.
* Aftercare: Proper aftercare is essential to maintain the health and appearance of permed hair. This includes using moisturizing shampoos and conditioners, deep conditioning treatments, and heat protectants.
Essentially, perm lotion is a powerful chemical that restructures the hair's internal bonds to achieve a new shape, but it's crucial to understand the potential impact on hair health and take necessary precautions.