What Does Relaxer Do to Hair? - FlyingMachineArena

Hair relaxers, a staple in the hair care industry for decades, are chemical treatments designed to permanently straighten curly, coily, or kinky hair textures. Their primary mechanism involves altering the hair’s internal structure, specifically the disulfide bonds that are responsible for hair’s shape and elasticity. Understanding this process is crucial for anyone considering or currently using relaxers, as it dictates both the aesthetic results and the potential impact on hair health.

Table of Contents

The Chemistry of Straightening: How Relaxers Work

At its core, a hair relaxer is a potent alkaline chemical solution. The goal is to break down the disulfide bonds within the hair shaft. These bonds, composed of sulfur atoms, create the natural curl pattern. When hair is exposed to the alkaline environment of a relaxer, these bonds are weakened and subsequently broken.

Breaking Down Disulfide Bonds

Hair’s natural shape is determined by the arrangement of its proteins, primarily keratin, and the strong disulfide bonds that link these protein chains. In curly hair, these bonds are arranged asymmetrically along the hair shaft, causing it to bend and curl. Relaxers work by introducing a chemical agent that can cleave these sulfur-sulfur bonds.

The most common active ingredients in traditional relaxers are sodium hydroxide (lye) and calcium hydroxide (no-lye). Both are strong bases that create an alkaline pH, typically between 12 and 14. This high pH environment causes the hair cuticle, the outermost protective layer, to swell and lift, allowing the relaxer to penetrate the cortex, the inner core of the hair where the disulfide bonds reside.

Once inside the cortex, the hydroxide ions (OH-) from the alkaline solution react with the disulfide bonds. This reaction, known as reduction, breaks the sulfur-sulfur linkages, converting them into sulfhydryl groups (-SH). This process effectively loosens the hair’s structure, allowing it to be straightened.

Neutralization: The Crucial Second Step

After the desired level of straightening is achieved, it is imperative to stop the chemical process. This is done through neutralization. Neutralizing shampoos and conditioners are acidic, with a pH typically ranging from 4.5 to 6.5. Their role is to:

Re-form Disulfide Bonds: The acidic environment encourages the sulfhydryl groups to re-form disulfide bonds, but this time in a straighter configuration. This locks the hair into its new, straightened state.
Restore pH Balance: The relaxer’s highly alkaline nature can leave the hair and scalp damaged and stripped of their natural moisture. Neutralization brings the hair’s pH back to a more normal, healthy level, which is essential for the integrity of the hair shaft and the scalp.
Close the Cuticle: As the pH is restored, the cuticle layers flatten and close, which helps to smooth the hair surface, add shine, and protect the inner cortex.

Different Types of Relaxers and Their Mechanisms

While the fundamental principle of breaking disulfide bonds remains the same, different types of relaxers employ slightly varying chemical approaches:

Lye Relaxers (Sodium Hydroxide): These are the most traditional and potent relaxers. Sodium hydroxide is highly effective at breaking disulfide bonds quickly. However, due to their extreme alkalinity, they pose a higher risk of chemical burns and scalp irritation if not used with extreme care and precision.
No-Lye Relaxers (Calcium Hydroxide/Magnesium Hydroxide): These relaxers utilize a combination of calcium hydroxide and guanidine carbonate to create a chemical reaction that forms guanidine hydroxide. This mixture is generally less harsh than lye, offering a lower risk of immediate scalp damage. While they may take longer to process, they are often preferred for individuals with sensitive scalps. They still break disulfide bonds, but the mechanism is slightly different, and the neutralization process is still critical.
Ammonium Thioglycolate Relaxers: Less common for home use but found in some professional salons, these relaxers use ammonium thioglycolate as the active ingredient. This chemical works by reducing disulfide bonds without the extreme alkalinity of lye or no-lye relaxers. They often require a separate neutralizer to reform the bonds.

The Impact of Relaxers on Hair Structure and Health

The chemical alteration of hair by relaxers is significant and has both immediate and long-term consequences for hair structure, strength, and overall health.

Structural Changes

The most obvious effect is the permanent straightening of the hair. Once the disulfide bonds are broken and reformed in a linear fashion, the hair loses its natural curl pattern. This change is permanent and cannot be reversed by washing or styling. The hair will grow out with its natural texture, but the previously relaxed portions will remain straight.

Beyond straightening, relaxers can also affect the hair’s porosity and elasticity. The cuticle layers are lifted and potentially damaged during the process, which can increase porosity, making the hair more susceptible to moisture loss and environmental damage. The chemical process itself can weaken the hair shaft, reducing its tensile strength and making it more prone to breakage.

Potential for Damage

The potent chemicals used in relaxers, while effective, can also be damaging if not handled correctly.

Scalp Burns and Irritation: The high alkalinity of relaxers can cause chemical burns, redness, itching, and even blistering on the scalp. This risk is amplified by leaving the relaxer on for too long, applying it to already irritated skin, or improper application techniques.
Hair Breakage: Over-processing, frequent use, or concurrent chemical treatments (like coloring or perms) can severely weaken the hair shaft, leading to breakage. The hair may snap easily, especially when wet or during styling.
Dryness and Brittleness: The process can strip the hair of its natural oils (sebum) and disrupt its moisture-binding capabilities, leading to dryness, brittleness, and a lack of shine.
Thinning and Hair Loss: In severe cases, chemical burns and prolonged damage can lead to localized or widespread hair loss. The weakened hair follicles may also struggle to produce strong, healthy new hair.
Damage to Natural Texture: While the goal is straightening, improper application or inconsistent processing can lead to uneven results, a condition often referred to as “ز ” or unevenly relaxed hair, where some areas are straight and others remain curly or frizzy.

Long-Term Considerations

The permanent nature of the straightening means that individuals who use relaxers must commit to ongoing care to maintain the health of their treated hair. This involves:

Regular Trims: To remove any split ends or damaged portions of the hair.
Moisturizing Treatments: Deep conditioners and leave-in treatments are essential to combat dryness.
Gentle Styling: Avoiding excessive heat and harsh manipulation.
Professional Application: For virgin hair or touch-ups, seeking professional application minimizes the risk of damage.

The Relaxer Application Process and Best Practices

Understanding the step-by-step process of applying a hair relaxer is crucial for maximizing results and minimizing potential damage. This typically involves several key stages, each requiring careful attention.

Pre-Treatment Preparation

Before applying any relaxer, thorough preparation is essential:

Strand Test: This is a non-negotiable step. A small, inconspicuous section of hair is treated with the relaxer to determine the processing time needed to achieve the desired straightness without causing damage. This also helps identify any adverse reactions to the chemicals.
Scalp Protection: A protective base, often petroleum jelly, is applied to the hairline, ears, and any exposed areas of the scalp to create a barrier against the relaxer.
Detangling: The hair should be thoroughly detangled to ensure even application and prevent matting during the chemical process.
Hair Condition: Relaxers should ideally be applied to unwashed hair (for at least 2-3 days) to allow the scalp’s natural oils to provide some protection. However, if the scalp is already irritated, washing may be necessary beforehand.

The Relaxer Application and Processing

This is the core stage where the chemical alteration occurs:

Sectioning: The hair is divided into manageable sections, typically four or more, to ensure thorough and even application.
Application: The relaxer cream is carefully applied to the hair, starting about a quarter-inch away from the scalp and working down to the ends. It is crucial to avoid direct contact with the scalp. For “touch-up” applications, the relaxer is only applied to the new growth.
Smoothing and Straightening: Using a comb with wide teeth or gloved fingers, the hair is gently smoothed and straightened to help the relaxer penetrate evenly and achieve the desired texture.
Processing Time: This is determined by the strand test. The relaxer is left on the hair for the specific duration indicated by the test. Over-processing is a common cause of severe damage.
Rinsing: Once the processing time is complete, the hair is thoroughly rinsed with lukewarm water to remove all traces of the relaxer. This step should be extensive to ensure no chemical residue remains.

Neutralization and Post-Treatment Care

The final stages are critical for sealing the deal and restoring hair health:

Neutralizing Shampoo: A specially formulated neutralizing shampoo is used to thoroughly cleanse the hair and scalp, effectively stopping the chemical action and restoring the hair’s pH balance. This is often a multi-step process.
Conditioning Treatment: A deep conditioning treatment or reconstructor is applied to replenish moisture, strengthen the hair, and smooth the cuticle.
Final Rinse and Styling: The hair is rinsed, and then styled as desired. It’s important to use heat protectants if using heat styling tools.

Alternatives and Considerations for Relaxed Hair

While relaxers offer a permanent straightening solution, the potential for damage and the commitment to ongoing maintenance lead many to explore alternatives or to focus on specific care routines for relaxed hair.

Chemical Relaxer Alternatives

For those seeking smoother, straighter hair without the commitment or potential risks of traditional relaxers, several alternatives exist:

Texturizers/Wav-ers: These products are less potent than relaxers and are designed to loosen the curl pattern rather than eliminate it entirely. They aim to reduce frizz and make the hair more manageable, often creating a looser wave or curl. The chemical process is similar but less intense.
Keratin Treatments (Brazilian Blowouts, etc.): These are semi-permanent smoothing treatments that coat the hair shaft with keratin, a protein. They reduce frizz, add shine, and make hair more manageable, but they do not chemically alter the disulfide bonds. The effects typically last 2-6 months, depending on the product and hair care.
Permanent Waving/Straightening: While often associated with curling, these chemical processes can also be used to straighten hair by breaking and reforming disulfide bonds in a straight configuration. However, they can still carry risks of damage.

Special Care for Relaxed Hair

Maintaining healthy relaxed hair requires a dedicated regimen:

Moisture is Key: Relaxed hair is often prone to dryness. Regular use of moisturizing shampoos, conditioners, and leave-in treatments is vital. Ingredients like shea butter, natural oils, and humectants can help.
Protein Treatments: While moisture is crucial, occasional protein treatments can help strengthen the hair shaft, which may have been weakened by the chemical process. This helps prevent breakage.
Gentle Handling: Avoid aggressive brushing, tight hairstyles, and excessive heat styling. Always use a wide-tooth comb and heat protectant sprays when necessary.
Regular Trims: Professional trims every 6-8 weeks are essential to remove split ends and maintain the health and appearance of the hair.
Scalp Health: A healthy scalp is the foundation for healthy hair. Ensure the scalp is clean, free from product buildup, and not irritated.

In conclusion, hair relaxers are powerful chemical treatments that permanently alter hair structure by breaking and reforming disulfide bonds. While they achieve the desired effect of straightening, understanding the chemistry involved, the potential for damage, and the importance of proper application and ongoing care is paramount for anyone choosing to use them.