How Long Does Hair Smoothening Last? A Complete Guide

Hair smoothening is one of the most popular hair treatments today for those seeking manageable, frizz-free, and sleek hair. Whether you're tired of spending hours blow-drying or straightening your locks, or simply looking for a polished look without daily heat styling, smoothening can be a game changer.

But a common question many people ask before committing to the process is: How long does hair smoothening last? The answer depends on several factors including the type of treatment, your hair type, how you care for your hair afterward, and your overall lifestyle.

In this complete guide, we’ll break down what to expect in terms of longevity, how to maintain the results, and when you may need a touch-up.

What Is Hair Smoothening?

Hair smoothening is a chemical process designed to tame frizz, reduce curls, and give hair a straighter, shinier appearance. It typically uses mild relaxers or smoothing agents, followed by heat from a flat iron, to lock in a smoother texture.

Unlike hair rebonding, which permanently restructures hair bonds for a pin-straight look, smoothening softens your natural texture. It’s especially ideal for people with wavy or mildly curly hair who want a more manageable and polished finish without losing all volume.

How Long Does Hair Smoothening Last?

On average, hair smoothening lasts between 3 to 6 months, depending on several factors:

1. Hair Type and Texture

• Fine, straight, or slightly wavy hair may hold the treatment longer — closer to 5 or 6 months.

• Thick, coarse, or tightly curled hair may see results lasting around 3 to 4 months before the natural texture begins to return.

2. Type of Smoothening Treatment

There are different types of smoothening treatments — each with varying formulas and effects.

• Cysteine treatment: Known to be gentle and safe, usually lasts 2 to 4 months.

• Keratin treatment (Brazilian blowout): Lasts around 3 to 5 months.

• Traditional smoothening (chemical relaxers): May last 4 to 6 months or longer with good maintenance.

3. Post-Treatment Hair Care

How well you maintain your hair after smoothening plays a huge role in the treatment’s longevity. Using sulfate-free shampoos, avoiding heat styling, and regular conditioning can extend the effect significantly.

4. Hair Growth

Smoothening is not permanent, so as new hair grows from the roots, it will come in your natural texture. This can make your hair appear uneven after a few months and may require a touch-up to maintain a uniform look.

Signs That Your Smoothening Treatment Is Wearing Off

You’ll start to notice the treatment fading as:

• Your natural texture returns at the roots.

• Hair becomes slightly more frizzy or puffy than it was just after treatment.

• Styling takes longer again or needs more heat to maintain the sleek look.

• The overall shine and softness starts to reduce.

These changes usually begin around the third month but vary based on hair type and routine.

How to Make Hair Smoothening Last Longer

With the right care, you can maximize the results of your smoothening treatment. Here’s how:

1. Use Sulfate-Free Shampoos

Sulfates are harsh detergents that strip away natural oils and the smoothening solution from your hair. Opt for shampoos and conditioners labeled “sulfate-free” and safe for chemically treated hair.

2. Avoid Frequent Washing

Washing your hair too often will reduce the lifespan of the treatment. Try to wash your hair 2 to 3 times a week and use dry shampoo in between if needed.

3. Minimize Heat Styling

One of the perks of smoothening is that your hair already looks styled. Avoid unnecessary use of straighteners, curlers, and hot dryers. If you must use heat, apply a heat protectant spray beforehand.

4. Deep Condition Weekly

Use a deep conditioning mask once a week to keep your hair moisturized and strong. Smoothened hair can become dry if not properly nourished.

5. Protect Hair While Swimming

Chlorine and salt water can strip the treatment from your hair. If you're heading to the pool or beach, wear a swim cap and rinse your hair with clean water afterward.

6. Limit Sun Exposure

Too much sun can cause hair to dry out and fade the effects of smoothening. Wear a hat or use a UV-protection hair serum when spending extended time outdoors.

7. Regular Trims

Trim your hair every 6 to 8 weeks to remove split ends and maintain a healthy look.

Should You Get Touch-Ups?

As your hair grows, the untreated new roots may look different from the rest of your smoothened hair. If this bothers you, you can opt for a touch-up treatment — typically focused on the roots or new growth.

Touch-ups are usually done around 3 to 4 months after the initial treatment, depending on your hair growth rate. However, avoid getting treatments too frequently, as overlapping applications can weaken hair over time.

Are There Alternatives to Full Reapplication?

If your hair still looks relatively good after a few months but needs a boost, some salons offer mini smoothening sessions or keratin boosters. These treatments restore shine, manageability, and frizz control without going through the full process again.

Is Hair Smoothening Permanent?

No, hair smoothening is not permanent. Unlike rebonding, which alters the structure of your hair permanently, smoothening wears off over time and your natural hair texture gradually returns.

This makes it a great option for people who want a temporary change without committing to permanent chemical treatments.

Is It Worth Repeating?

If you enjoyed your results and your hair remained healthy, many people find it worthwhile to repeat the process once or twice a year. Always give your hair a few months to rest between sessions to avoid damage.

Final Thoughts

Hair smoothening can give you sleek, manageable, and frizz-free hair that lasts for several months—but like any beauty treatment, its lifespan depends on your hair type, how it’s done, and how you care for it afterward.

On average, you can expect 3 to 6 months of smooth, shiny hair with proper care. By following good aftercare habits like using the right products, avoiding heat, and conditioning regularly, you can enjoy longer-lasting results and healthier hair.

Whether you’re considering smoothening for the first time or planning your next session, knowing what to expect helps you make the most of your investment—and your hair.