When Can You Wash Your Hair After a Keratin Treatment?
A keratin treatment is a salon smoothing service: a keratin-based formula is applied to each strand and sealed in with heat, leaving hair smoother and less frizzy for three to five months. What you do in the first 72 hours decides how long that lasts.
Quick answer: Wait 72 hours before you wash your hair after a keratin treatment. Keep it dry and loose for those three days, with no ponytails, clips or tucking it behind your ears. After that, wash with a sulfate-free shampoo in lukewarm water, no more than two or three times a week, to make the smoothing last.
By Melissa, owner and stylist at Hair By Melissa, Kaukapakapa · Updated
Based in North Auckland? Melissa does keratin treatments at her Kaukapakapa salon for $180, about 2–3 hours. See the keratin treatment →
A keratin treatment is an investment in your hair's health and manageability. At Hair By Melissa, our formaldehyde-free keratin treatments can last up to 5 months — but only with proper aftercare. Here's exactly what to do, question by question.
When can I wash my hair after a keratin treatment?
Wait 72 hours before washing your hair after a keratin treatment. During this window the keratin is still bonding with your hair cuticles, and moisture, chemicals or physical manipulation can disrupt that process and reduce how long the treatment lasts.
Also avoid for 72 hours
- • No swimming, rain or humidity
- • No heat styling tools, saunas or steam rooms
- • No hair products except a recommended dry shampoo
- • Avoid excessive sweating
Keratin aftercare day by day
| Period | Wash | Style | Avoid |
|---|---|---|---|
| Days 1–3 | None — wait the full 72 hours before your first wash | Keep hair completely loose; only comb gently with a wide-tooth comb if absolutely necessary — no ponytails, clips, bands, headbands or hats | Swimming, rain, humidity, heat styling, saunas, steam rooms, excessive sweating and any product except a recommended dry shampoo |
| Days 4–14 | Sulfate-free shampoo, lukewarm water and a cool rinse; no more than 2–3 washes a week | Brush gently morning and night, leave-in conditioner on the ends and heat protectant before styling; sleep on a silk or satin pillowcase | Sulfate or clarifying shampoos, sea salt sprays, alcohol-based or paraben products, and chemical colour processing |
| From week 3 | Wash every 2–3 days as needed | Chemical colour is now possible — book a consultation so your stylist can plan colour and keratin together | — |
| Ongoing | Return to a normal washing schedule; use dry shampoo between washes to stretch it out | Heat style no more than 2–3 times a week with heat protectant, air-drying the rest of the time | Sulfate shampoos; watch for frizz returning to the roots as a sign it's time for a touch-up around 4–5 months |
Can I brush or comb my hair after keratin?
Not in the first 72 hours — avoid brushing altogether, and only comb gently with a wide-tooth comb if it's absolutely necessary. Don't touch or run your fingers through your hair, and try to keep head movement to a minimum while you sleep.
NO Physical Manipulation (first 72 hours)
- • Don't touch or run fingers through hair
- • Avoid tucking behind ears
- • No excessive head movement during sleep
Brushing once you're past 72 hours
- • Morning: gently brush with a wide-tooth comb, apply leave-in conditioner to the ends, and use heat protectant before styling
- • Night: brush gently to distribute natural oils, sleep on a silk or satin pillowcase, and avoid tight hairstyles
Can I tie my hair up after keratin?
No — for the first 72 hours your hair needs to stay completely loose. Any tie, clip or crease can set into the new keratin bonds while they're still forming, leaving a dent or wave where it shouldn't be.
NO Hair Accessories (first 72 hours)
- • No ponytails or buns
- • Avoid hair clips or bands
- • No headbands or hats
- • Sleep with hair completely loose
Can I use dry shampoo after a keratin treatment?
Yes — dry shampoo is the one product you're allowed to use during the first 72 hours if your roots get oily, applied sparingly at the roots only. Once you're past the 72-hour mark, dry shampoo between washes is a good way to stretch out your 2–3 washes a week and keep the treatment lasting longer.
Ready for smooth hair that lasts? Book a keratin treatment in North Auckland or call 0274 799 320.
What happens if my hair gets wet in the first 72 hours?
Don't panic — immediately blow-dry your hair straight with medium heat and a round brush to reset it. It isn't ideal and can shorten how long the treatment lasts, but quick action minimizes the damage. Contact your stylist if you're concerned about the result.
Troubleshooting common issues
Problem: Hair Feels Stiff or Crunchy
Cause: Product buildup or using the wrong products
- • Use a clarifying shampoo once, then a deep conditioning treatment
- • Switch to keratin-safe products
Problem: Frizz Returning Early
Cause: Using sulfate shampoos or exposure to chlorine
- • Switch to sulfate-free products and increase deep conditioning
- • Reduce heat styling frequency, or consider a touch-up treatment
Problem: Hair Looks Greasy or Flat
Cause: Over-conditioning or using too much product
- • Reduce conditioning frequency and focus it on the ends only
- • Use less product, or try a lightweight leave-in conditioner
What shampoo should I use after keratin?
Use a sulfate-free, sodium chloride-free, pH-balanced shampoo and conditioner — sulfates strip the keratin from your hair and shorten the treatment's lifespan. Wash no more than 2–3 times a week with lukewarm water and finish with a cool rinse to seal the cuticle.
Product recommendations
Essential Product Guidelines
MUST USE
- Sulfate-Free Shampoo: Protects keratin bonds
- Sodium Chloride-Free Products: Prevents treatment breakdown
- pH-Balanced Conditioner: Maintains hair health
- Heat Protectant: Essential before any heat styling
- Deep Conditioning Mask: Weekly treatments
AVOID COMPLETELY
- Sulfate-Based Shampoos: Strip keratin treatment
- Clarifying Shampoos: Too harsh for treated hair
- Sea Salt Sprays: Dry out treated hair
- Alcohol-Based Products: Cause dryness and frizz
- Products with Parabens: Can break down treatment
Optimal washing routine
Step-by-Step Washing Process
- 1 Pre-rinse: lukewarm water only — hot water opens the cuticle and can strip the keratin.
- 2 Shampoo gently: sulfate-free, focused on the scalp, no scrubbing.
- 3 Condition: mid-length to ends only, leave 2-3 minutes, then rinse.
- 4 Cool rinse: seals the cuticle and locks in the treatment.
Washing Frequency Guidelines
- Week 1-2: Wash 2-3 times maximum
- Week 3-8: Wash every 2-3 days as needed
- Month 2+: Return to normal washing schedule (every other day or daily if needed)
- Pro Tip: Use dry shampoo between washes to extend time between washing
How long does a keratin treatment last?
A keratin treatment lasts three to five months with proper aftercare — Hair By Melissa's formaldehyde-free formula can last up to 5 months when you follow the wash, product and heat-styling guidelines above. Limiting heat, using the right products and handling hair gently all extend its life.
Heat styling best practices
- • Flat iron 300-350°F max, curling iron 300°F max, always with heat protectant
- • Heat styling maximum 2-3 times per week — air dry the rest of the time
- • Blow dryer on medium heat with a cool shot finish
When to book your next treatment
Signs It's Time for a Touch-Up
- Frizz returning to the root area, or hair texture feeling coarser
- Increased styling time needed, or humidity affecting hair more
- 4-5 months since your last treatment
When can I colour my hair after keratin?
Wait at least 2 weeks after a keratin treatment before any chemical colour processing. Timing matters — book a consultation so your stylist can plan your colour and keratin schedule together for the best results without compromising either treatment.
Booking a keratin treatment? See prices and what's included for a keratin treatment in North Auckland.
Frequently Asked Questions
Get answers to common questions about our services and booking process.
When can I wash my hair after a keratin treatment?
Wait 72 hours before washing your hair after a keratin treatment. The keratin is still bonding with your hair cuticles during that window, so moisture can disrupt the process.
Can I brush or comb my hair after keratin?
In the first 72 hours, avoid brushing — only gently comb with a wide-tooth comb if absolutely necessary. After that, gently brush morning and night to distribute natural oils and keep hair smooth.
Can I tie my hair up after keratin?
No — for the first 72 hours keep your hair completely loose. No ponytails, clips, bands, headbands, hats or tucking behind your ears, since any crease can set into the new keratin bonds.
Can I use dry shampoo after a keratin treatment?
Yes — dry shampoo is the one product allowed during the first 72 hours if your roots get oily, applied sparingly at the roots only. Afterwards, it's a good way to stretch out your 2–3 washes a week.
What happens if my hair gets wet in the first 72 hours?
Don't panic — immediately blow-dry your hair straight with medium heat and a round brush to reset it. It isn't ideal and may shorten how long the treatment lasts, but quick action limits the damage.
What shampoo should I use after keratin?
Use a sulfate-free, sodium-chloride-free, pH-balanced shampoo and conditioner — sulfates strip keratin from the hair and shorten the treatment's life. Wash no more than 2–3 times a week with lukewarm water and a cool final rinse.
How long does a keratin treatment last?
A keratin treatment lasts three to five months with proper aftercare, and up to 5 months with Hair By Melissa's formaldehyde-free formula. Sulfate-free products and limited heat styling extend its life — book a touch-up once frizz returns to the roots or it's been 4–5 months.
When can I colour my hair after keratin?
Wait at least 2 weeks after a keratin treatment before any chemical colour processing. Book a consultation so your stylist can plan your colour and keratin schedule together.
Have More Questions?
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