How Long Does a Keratin Treatment Last?

Month by month

Because it fades rather than growing out, there is no point at which your hair looks half-treated in a visible line. That gradual ending is the practical advantage over chemical straightening and it means rebooking is a choice rather than a repair.

What shortens it

The top row explains most cases of "mine only lasted two months". A sulphate shampoo is doing exactly what it is designed to do — removing what is coating the hair — and the treatment is part of what it removes.

Extending it

1. 1Sulphate-free shampoo. Non-negotiable, and it does not have to be an expensive one.
2. 2Wash less frequently, and use dry shampoo between washes.
3. 3Rinse your hair with clean water before swimming — hair that is already saturated absorbs less pool or sea water.
4. 4Avoid clarifying shampoos entirely for the life of the treatment.
5. 5Consider a shower filter if you have hard water.
6. 6Use a sulphate-free conditioner too, not just shampoo.
7. 7Keep heat styling moderate — you should need much less of it anyway.

The first 72 hours decide a lot

Protocols vary by product, so ask your stylist for the specific rules for what they used rather than applying a rule you read somewhere. Many products require:

• No washing for 48 to 72 hours.
• No tying up, clipping, or tucking behind the ears — creases can set.
• No headbands, hats or sunglasses pushed back into the hair.
• Hair kept straight and loose, including overnight.

Why yours faded early

If a treatment ended well short of three months, the cause is usually identifiable and usually fixable next time.

The fourth row is worth raising with the salon rather than absorbing. A result that never appeared at all is different from one that faded, and most salons would rather hear about it within the first two weeks.

When to rebook

Most people rebook somewhere between months three and five, when frizz has returned enough to be annoying. There is no requirement to rebook on a schedule, and stretching the interval is not a problem in itself.

The third row is the one to respect. The flat-iron stage is high heat repeated over the whole head, and doing it more often than the product interval is how a smoothing habit turns into a damage problem.

What fading actually looks like

Knowing the sequence stops month three feeling like a failure. It ends the same way for almost everyone, in roughly this order.

• Drying time creeps up first. Usually the earliest signal, before anything is visible in the mirror.
• Frizz reappears at the hairline and crown before the lengths do.
• Humidity starts affecting your hair again on days it previously did not.
• Texture returns evenly, with no line and no patchiness.
• If it goes patchy rather than fading evenly, that is worth raising with the salon.

None of that requires action. A treatment ending on schedule is not a treatment that failed, and a break between rounds gives your hair a rest from repeated heat processing.