Relaxed hair is naturally curly or coily hair that has been permanently straightened using a chemical treatment called a relaxer. The process works by breaking the protein bonds inside each hair strand and reforming them in a straighter configuration. It’s one of the most common chemical treatments for Afro-textured hair, and the results last until new hair grows in at the root, typically requiring a touch-up every 6 to 8 weeks.
How Relaxers Change Hair Structure
Your hair gets its shape from a protein called keratin. Keratin chains are held together by strong chemical links called disulfide bonds, and the pattern of those bonds determines whether your hair is straight, wavy, or tightly coiled. A relaxer breaks those bonds using a highly alkaline chemical, then the bonds reform while the hair is held in a straighter position. This permanently rearranges the protein structure of the strand.
The key word is “permanently.” Once a section of hair has been relaxed, it stays straight. It won’t revert back to its natural curl pattern. However, new hair that grows from the root will still have your natural texture, which is why touch-ups are necessary. Over time, you’ll have two distinct textures on the same strand: the straight, relaxed ends and the curly new growth near the scalp.
Lye vs. No-Lye Relaxers
Relaxers come in two main categories, and the names refer to their active ingredient. Lye relaxers use sodium hydroxide (the same compound found in drain cleaners, which gives you a sense of how powerful it is). No-lye relaxers typically use calcium hydroxide mixed with guanidine carbonate, or sometimes lithium hydroxide. No-lye formulas were introduced as a supposedly gentler alternative.
In practice, the difference is smaller than the marketing suggests. A study published in the South African Medical Journal tested 121 relaxer products and found no significant difference in pH between lye and no-lye formulas. The median pH across all products was 12.36, which is well above the 11.5 threshold classified as corrosive to skin. Both types are strong enough to cause chemical burns if misused.
One real difference is packaging. In that same study, 91% of sodium hydroxide (lye) relaxers for adults were sold without a neutralizing shampoo in the box. All calcium hydroxide (no-lye) relaxers included one. Since the neutralizing step is critical to stopping the chemical reaction, this is a meaningful practical distinction if you’re buying a kit for home use.
The Relaxing Process Step by Step
Before any chemical touches the hair, the scalp needs protection. A petroleum-based cream or specialized scalp protector is applied directly to the scalp, hairline, nape of the neck, and around the ears. This barrier prevents the alkaline relaxer from making direct contact with skin. Skipping this step, or doing it carelessly, is a common cause of chemical burns.
The relaxer cream is then applied section by section, starting with the areas of thickest or most resistant hair (usually the back of the head). For a first-time, or “virgin,” relaxer, the product goes on the full length of the hair but not the scalp. For touch-ups, it’s applied only to the new growth near the roots to avoid double-processing hair that’s already been relaxed. Over-processing previously relaxed hair is one of the fastest ways to cause breakage.
The relaxer sits on the hair for a specific amount of time, usually determined by hair texture and the product’s strength. During this window, the alkaline chemicals are actively breaking and rearranging bonds inside the hair shaft. When the desired level of straightness is reached, the relaxer is rinsed out thoroughly with water.
Why Neutralizing Matters
Rinsing alone isn’t enough. After the relaxer is washed out, a neutralizing shampoo is applied to halt the chemical reaction completely. This shampoo has a neutral or slightly acidic pH that counteracts any alkaline residue left on the hair and scalp. Without it, the relaxer’s chemicals would continue breaking down the hair’s protein structure, leading to severe damage.
Many neutralizing shampoos contain a color indicator, often turning pink or another color when alkaline residue is still present, and returning to its normal shade once the hair is fully neutralized. The shampoo needs to be worked through the hair multiple times to ensure all residual chemicals are removed. This is not a step to rush.
Relaxers vs. Texturizers
A texturizer uses the same type of chemical as a relaxer but is left on for a shorter period of time. The goal isn’t to make the hair bone-straight. Instead, it loosens the natural curl pattern into softer, more manageable waves or curls while keeping some of the original texture intact. Think of it as a partial relaxer. The hair is still chemically altered, but retains more of its natural movement. People who want easier styling without giving up their curl pattern entirely often prefer this option.
Touch-Up Timing
Most stylists recommend getting a relaxer touch-up every 6 to 8 weeks, which is typically when you have about 1 to 2 inches of new growth. Some people stretch their touch-ups to 10 or 12 weeks, which can actually be better for the hair’s overall health since it means fewer chemical applications per year. The tradeoff is managing two very different textures on the same head, as the line where relaxed hair meets natural new growth (called the “line of demarcation”) is a weak point prone to breakage.
Caring for Relaxed Hair
Relaxed hair is structurally weaker than natural hair because the chemical process permanently alters the protein bonds that give strands their strength. This means relaxed hair needs a careful balance of moisture and protein to stay healthy. Moisture keeps the hair flexible and prevents dryness, which is especially important since relaxed hair tends to lose hydration faster. Protein treatments help reinforce the hair shaft and repair some of the structural damage caused by the relaxer. Look for products containing keratin, hydrolyzed wheat protein, or silk protein for this purpose.
Too much protein makes relaxed hair stiff and brittle. Too much moisture without protein makes it mushy and limp. The goal is finding the right balance for your hair, which often means alternating between protein-rich and moisture-rich deep conditioning treatments. Many people with relaxed hair deep condition weekly or biweekly.
Heat styling should be used sparingly. Relaxed hair has already undergone significant chemical stress, and adding frequent flat iron or blow dryer use compounds the damage. Sleeping on a satin pillowcase or wrapping hair in a silk scarf at night reduces friction that can cause breakage at the fragile line of demarcation. Gentle handling overall, from detangling with a wide-tooth comb to avoiding tight hairstyles that pull on the roots, goes a long way toward retaining length and thickness.
Potential Risks and Damage
The pH level of hair relaxers is high enough to be classified as corrosive to skin. Chemical burns on the scalp, ears, and forehead are common, especially when the protective base is applied unevenly or the relaxer is left on too long. These burns can range from mild irritation to open sores that take weeks to heal.
Repeated relaxer use has been linked to a higher prevalence of hair loss in women with Afro-textured hair. The damage is cumulative: each application weakens the hair shaft further, and over-processing or overlapping the relaxer onto previously treated hair can cause the strand to snap. Thinning edges and breakage at the crown are two of the most visible signs of relaxer damage over time.
Going back to your natural texture after years of relaxing requires growing out the relaxed hair entirely, since there is no chemical process that reverses a relaxer. This transition, often called “going natural,” can take anywhere from several months to two or more years depending on your desired length, or you can do a “big chop” and cut off all the relaxed hair at once.