Perms, Relaxers, and Texturizers: What They Do to Hair Bonds
Hair’s shape, strength, and texture come from networks of chemical links inside each strand. Relaxers, perms, and texturizers all work by changing those links—but they do it in different ways and to different degrees.
Let's take a look at what actually happens to your hair when you use these treatments and how they affect your hair.
Understanding the Bonds in Your Hair
Hair is made primarily of a protein called keratin. Keratin influences the look, feel, and nature of a person’s hair. Its structure depends partly on different bonds and interactions that hold the protein together.
Three are particularly important when discussing chemical hair treatments, and they are hydrogen bonds, salt (ionic) bonds, and disulfide bonds (the strongest of the three).
Think of these bonds as connections within a flexible structure. Some respond easily to water and heat, while others require chemical treatments to change. This helps explain why a temporary blowout differs from a chemical relaxer or permanent wave.
Perms: Chemically Creating Curls
Permanent waves, commonly called perms, use chemical reactions to create curls or waves that last beyond a wash. This happens in two basic steps:
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First, a reducing lotion (like a thioglycolate or a similar compound) breaks some of the disulfide bonds within keratin by donating electrons (tiny mobile parts of atoms) to disulfide bonds. The hair is then wrapped around rods to establish the desired curl pattern.
Next, an oxidizing neutralizer (usually hydrogen peroxide) helps reform disulfide bonds by stealing electrons from disulfide bonds while the hair is held in its new shape. The resulting arrangement helps the hair maintain its curls.
Imagine loosening the connections within a flexible structure, reshaping it, and restoring some of those connections while it remains in the new position. This provides a simplified explanation of how a traditional perm works.
However, the subsequent introduction of an oxidizing neutralizer does not perfectly restore every original bond, and that’s why chemical processing can also affect the hair's strength and condition.
Why is it called a permanent wave if the curls eventually change? The treatment produces lasting changes in the processed hair, but new growth emerges with its natural texture. Over time, the difference between the treated hair and new growth can become more noticeable.
Relaxers: Chemically Straightening Hair
Relaxers are designed to loosen the natural curl pattern of hair, making it straighter. They alter keratin by changing the structure of disulfide bonds. However, different relaxers work through different chemical pathways:
Hydroxide relaxers which may contain sodium hydroxide (lye) or calcium hydroxide-based ingredients (no-lye), work under strongly alkaline conditions. They cause the hair's cuticle (outer layer) to swell and lift, allowing the active chemicals to penetrate into the cortex (the inner core where the disulfide bonds reside), break disulfide bonds, and transform a portion of the keratin structure. In this transformation, disulfide bonds are not reformed.
Thio relaxers also cause the cuticle to swell, allowing active chemicals (like ammonium thioglycolate) to penetrate into the cortex, but they work differently. They use reducing agents to break some disulfide bonds. The hair can then be reshaped into a straighter configuration, and an oxidizing neutralizer helps reform disulfide bonds in the new arrangement. Thio relaxers are generally milder, and because disulfide bonds are reformed rather than replaced, the effect of thio relaxers can be less permanent.
Although both types straighten hair, their chemical processes are different. The results are long-lasting because the treated hair's structure has been chemically altered. Washing cannot restore its original curl pattern.
Texturizers: Chemically Loosening Natural Curls
Texturizers are intended to loosen natural curls rather than straighten the hair completely.
Many texturizers use ingredients similar to those found in hydroxide or thio relaxers; they use hydroxide-based ingredients or reducing agents (like ammonium thioglycolate). They change the hair's keratin structure under alkaline conditions, allowing the natural curl pattern to become looser.
The outcome depends on the product formulation, processing time, hair characteristics, and application technique. Many texturizers are literally the same product as relaxers with lower concentrations or shorter application times (“texlaxing” as used in the hair community).
For most people, the result is a less extensive disulfide bond cleavage, producing elongated curls or a looser coil pattern rather than completely straight hair.
However, a texturizer is not necessarily harmless simply because it is intended to produce a less dramatic change. The chemistry is similar to that of a relaxer, but the degree is different. The main distinction is the intended result, not the absence of chemical alteration.
Choosing Between Options
The right treatment depends on the hairstyle you want, your hair's condition, and how much chemical processing you are comfortable with.- Want long-lasting curls or waves? A perm can reshape straight or wavy hair into curls that last beyond a wash.
- Want straight hair? Relaxers can permanently alter your hair's natural curl pattern and straighten your hair completely.
- Want to loosen your natural curls without completely straightening them? A texturizer may help you achieve a looser curl or wavy pattern.
Before choosing any of these treatments, consider your hair's current condition. Remember that the results may be long-lasting, but the effects on hair strength and condition depend on the product, application, and aftercare.
How Do These Treatments Affect Hair Health?
Changing hair's internal structure can make it easier to style, but these treatments also carry potential risks. When disulfide bonds are intentionally broken and reformed, several measurable hair properties change. Possible consequences include:
- Breakage: Weakened strands may snap during combing or styling.
- Roughness: Cuticle damage due to swelling can make hair feel less smooth.
- Reduced elasticity: Overprocessed hair may become less able to stretch and recover without breaking.
- Tangling: A rougher cuticle surface can increase friction between strands.
The severity varies depending on the treatment, the hair's condition, the application technique, and subsequent care. Also, the effects of these treatments are cumulative. Applying a relaxer to hair that has already been relaxed—or overlapping products during a touch-up—can cause severe damage.
Conditioners can improve softness, reduce friction, and make damaged hair easier to manage. However, they cannot fully restore the original structure of hair that has undergone permanent chemical changes.
Safer Practices and Aftercare
Understanding bond chemistry points directly to practical care steps:- Professional application matters. Stylists control timing and placement to avoid over-processing and minimize bond damage.
- Neutralize and rinse thoroughly. Leaving alkaline residue keeps cuticles lifted and accelerates damage.
- Deep-condition regularly. Protein treatments and conditioners help temporarily reinforce structure and improve elasticity.
- Limit excessive heat. Heat breaks hydrogen bonds — useful for styling, but repeated high heat on already-modified hair increases cumulative damage.
- Space chemical services. Allow hair to grow and recover before repeating relaxers or perms; consider trims to remove highly damaged ends.
- Protect your scalp. Do not apply chemical treatments to an irritated or damaged scalp.
Final Thought
Perms, relaxers, and texturizers all do one fundamental thing: they change hair’s disulfide bonds to alter shape. The difference is degree and method.
Although their results differ, these treatments can affect hair strength and structure. This knowledge enables you to choose the right service, ask the right questions at the salon, and protect your strands with targeted care.
Further Reading
- Chemical Bonds and Hair Behaviour—A Review — A scientific review of the interactions that influence hair structure and mechanical behavior.
- An Overview of Chemical Straightening of Human Hair — A review of chemical straightening mechanisms, hair-fiber damage, and the chemistry of lanthionization.
- Effect of Shampoo, Conditioner and Permanent Waving on the Molecular Structure of Human Hair — Research examining structural changes associated with permanent waving.
- Ten Pearls Every Dermatologist Should Know About the Appropriate Use of Relaxers — Dermatological guidance on relaxer use and associated risks.
- Hair Dye and Hair Relaxers: U.S. Food and Drug Administration — Consumer safety guidance for chemical hair products.
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