What you can and cannot change about your hair
You cannot change your hair's natural texture or type permanently without damaging it. Your hair type is determined by your genetics — the shape of your hair follicles and the structure of each strand. A person with straight hair has round follicles; a person with curly hair has flat, spiral-shaped follicles. No treatment rewires that.
What you can do is alter how your hair looks and behaves for weeks or months at a time using chemical treatments, heat styling, or product routines. You can also damage your hair so severely that it breaks off and grows back differently — but that is damage, not a real change, and it carries real costs to your hair's health.
The distinction matters because many products and salons market permanent texture changes that are actually semi-permanent chemical treatments. Understanding what is actually happening to your hair helps you make choices that keep it healthy.
Key Takeaways
- Your natural hair type is set by your genetics and cannot be permanently changed without causing damage.
- Chemical relaxers, perms, and keratin treatments alter the structure of your hair temporarily, usually lasting weeks to months before fading or growing out.
- Heat styling and product routines can make your hair appear to be a different type, but the effect disappears when you wash or stop the routine.
- Permanent straightening or curling treatments damage hair over time and require ongoing maintenance to prevent breakage and dryness.
- The healthiest approach is to work with your natural hair type using products and techniques designed for it.
Chemical relaxers and how long they actually last
A chemical relaxer breaks down the bonds that give curly hair its shape, leaving it straighter. The most common types use sodium hydroxide or calcium hydroxide. The treatment is applied to the hair shaft, left on for 5 to 20 minutes depending on your hair texture, then rinsed out. The straightening effect is permanent on that section of hair — it does not wash out.
However, your scalp keeps growing new hair with your original texture. Within 4 to 8 weeks, you will have visible new growth at the roots. To maintain the straight look, you need a touch-up relaxer applied only to the new growth, typically every 6 to 8 weeks. Each relaxer process stresses your hair, making it more prone to breakage and dryness over time.
Relaxers work best on coarser, tightly curled hair. On finer or already-damaged hair, they can cause severe breakage. A stylist should do a strand test 24 hours before the full process to check how your hair will react.
Perms: creating curls in straight hair
A perm (permanent wave) does the opposite of a relaxer — it creates curls in straight hair by breaking and reforming the same chemical bonds. The process uses a chemical lotion (usually ammonium thioglycolate), a neutralizer, and heat or rods to set the curl pattern. Like a relaxer, the curl is permanent on that hair shaft.
New growth will be straight, so you will see a line between permed and unpermed hair within 4 to 6 weeks. Touch-ups are needed every 6 to 8 weeks to maintain an even curl throughout your hair. Perms are gentler than relaxers on some hair types but can still cause dryness and frizz, especially if your hair is already damaged or fine.
The curl pattern you get depends on the size of the rods used and how long the chemicals stay on your hair. Smaller rods create tighter curls; larger rods create loose waves. A good stylist will choose rod size based on your hair texture and the look you want.
Keratin treatments and other semi-permanent options
Keratin treatments coat the hair shaft with a protein-based product that temporarily smooths the cuticle and reduces frizz. They do not chemically alter your hair's structure the way relaxers or perms do. The effect lasts 2 to 3 months and gradually fades as you wash your hair. They are gentler than chemical relaxers but also less dramatic — they smooth and shine rather than fully straighten.
Other semi-permanent options include Japanese straightening (which uses chemicals similar to relaxers but in a different process) and Brazilian blowouts (which use formaldehyde-based products to smooth hair). These last 3 to 6 months depending on how often you wash. All of them fade over time and require reapplication if you want to maintain the effect.
The appeal of semi-permanent treatments is that they are reversible — your natural texture returns as the treatment wears off. The downside is that they are expensive (typically $150 to $400 per treatment) and need to be redone regularly.
Heat styling and product routines for temporary changes
You can make your hair appear to be a different type without any chemical treatment by using heat and products. A flat iron can straighten curly hair; a curling iron or blow dryer with a round brush can add waves to straight hair. These changes last only until you wash your hair or until humidity and time undo the styling.
Styling products like serums, creams, and gels can also change how your hair looks and behaves. A smoothing serum can make curly hair look sleeker; a curl-defining cream can enhance waves in straight hair. Again, these effects wash out and are completely reversible.
The advantage of heat and product routines is that they are free of chemical damage and completely temporary. The disadvantage is that they require daily or weekly effort and do not create a lasting change. Heat styling also carries a risk of heat damage if you use high temperatures regularly without heat protectant products.
The damage that comes with permanent texture changes
Every chemical treatment — relaxers, perms, keratin, Japanese straightening — stresses your hair. The chemicals open the cuticle (the outer layer of each strand), alter the internal structure, and then close the cuticle again. This process weakens the hair, making it more prone to breakage, split ends, and dryness.
Repeated treatments compound the damage. Hair that has been relaxed or permed multiple times becomes thinner, more fragile, and more likely to break off. If you continue treating damaged hair, you can end up with hair that is too weak to grow long or hold a style.
To minimize damage, space treatments at least 6 to 8 weeks apart, use a deep conditioning routine between treatments, and trim your hair every 6 to 8 weeks to remove damaged ends. If your hair is already very damaged, it may be healthier to cut off the treated sections and let your natural hair grow in.
Working with your natural hair type instead
The healthiest option is to work with your natural hair type using products and techniques designed for it. Curly hair needs moisture-rich products and techniques like the "curly girl method" (which avoids sulfates, silicones, and heat). Straight hair benefits from volumizing products and lighter conditioners. Wavy hair often needs products that define the wave without weighing it down.
Learning to style your natural hair takes time and experimentation, but it costs less than ongoing chemical treatments and causes no damage. Many people find that once they stop fighting their natural texture and start enhancing it, they like their hair better than they did when they were trying to change it.
If you do choose a chemical treatment, think of it as a temporary change that requires maintenance, not a permanent fix. Budget for touch-ups every 6 to 8 weeks, plan a deep conditioning routine, and be prepared for the possibility that your hair may not tolerate repeated treatments.
Frequently Asked Questions
Will my hair go back to its natural texture after a relaxer or perm?
Only the new hair that grows in will be your natural texture. The hair that was treated will stay relaxed or permed until it breaks off or you cut it off. If you stop getting touch-ups, you will have a line of demarcation between your natural texture at the roots and the treated hair below.
Can I relax my hair if it is already damaged?
A strand test 24 hours before the treatment will show whether your hair can handle it. If your hair is very damaged, a relaxer may cause severe breakage. In that case, cutting off the damaged sections and letting your natural hair grow in is usually the safer choice.
How much does it cost to maintain a relaxer or perm?
Touch-up treatments typically cost $40 to $150 depending on your location and salon, and you need them every 6 to 8 weeks. Deep conditioning treatments and trims add to the cost. Over a year, maintenance can run $300 to $800 or more.
Is keratin treatment safer than a chemical relaxer?
Keratin treatments are gentler because they do not chemically alter your hair's structure. However, some keratin products contain formaldehyde, which can be harmful if inhaled. Look for formaldehyde-free options and make sure the salon has good ventilation.
Can I use heat styling every day without damaging my hair?
Daily heat styling without protection will damage your hair over time. If you use heat daily, always explore a heat protectant product first, use the lowest effective temperature, and do a deep conditioning treatment at least once a week.