You just left the salon with the smoothest hair you've ever had. The first 14 days determine whether that result lasts 8 weeks or 12. We've watched hundreds of keratin and Brazilian Blowout clients walk back in at week 6 wondering why their hair didn't hold. The answer is almost always the same: aftercare. Here's exactly what to do, and what to skip, to get the full lifespan from your treatment.
The first 48 hours: what the rules actually are
With a traditional keratin treatment, the old rule was 72 hours of no washing, no tying up, no clips. With a modern Brazilian Blowout, you can wash the same day. Always ask your stylist which formula they used, it's the difference between a stress-free first weekend and an accidentally ruined treatment.
If you got a traditional keratin (Cezanne, Goldwell Kerasilk, others):
- No washing for 72 hours
- No hair ties, headbands, clips, or sunglasses on top of your head
- No tucking behind your ears
- No bobby pins
- Sleep on a silk pillowcase
If you got a Brazilian Blowout, you can skip every restriction above. Wash today if you want. The treatment is locked in.
The shampoo question
The single biggest mistake post-keratin clients make is using the wrong shampoo. Two ingredients break down your treatment fast:
- Sulfates (sodium lauryl sulfate, sodium laureth sulfate). These strip the keratin layer off your cuticle.
- Sodium chloride (salt). Reads as "sodium chloride" on the back of the bottle. Just as stripping as sulfates.
Check the back of your current shampoo. If you see either ingredient in the first 8 listed, switch. Every salon-grade aftercare shampoo we carry at Joseph's is formulated specifically for keratin and Brazilian Blowout maintenance.
The frequency question
Wash your hair less. The treatment lasts longer when you give the cuticle less reason to open and release the keratin. Two to three washes per week is the sweet spot. Dry shampoo on the days in between. Cool water only.
Heat tools after keratin
You can still use heat tools. That's the point of the treatment, your hair smooths and dries faster, with less heat needed. But always use a heat protectant, and don't push your flat iron higher than 400°F. Higher heat erodes the keratin layer faster than the treatment can handle.
Color and keratin: the timing
If you want to color your hair within 4 weeks of a keratin treatment, you have to think about it as a system, not two separate services. The order matters:
- Color first, keratin second: Best. Color in week 1, keratin in week 2 or 3.
- Keratin first, color second: Wait at least 2 weeks. Some clients wait 4.
- Same day: Possible with Brazilian Blowout specifically. Ask us.
Pool, ocean, and the gym
Chlorine and salt water are the second-fastest way to break down a smoothing treatment. If you swim regularly:
- Wet your hair with fresh water before getting in (saturated hair absorbs less chlorine)
- Coat ends with a leave-in conditioner before swimming
- Wear a swim cap when possible
- Rinse immediately after getting out
- Wash with sulfate-free clarifying shampoo within 2 hours
For the gym, tie your hair up loosely once you start sweating. Sweat dries on the hair and creates exactly the buildup keratin treatments are trying to prevent. Wash within 24 hours of a sweaty workout.
What about purple shampoo if I'm blonde?
Skip it for the first 2 weeks. Sulfate-free purple shampoos are fine after that, but go light, once a week, not every wash. Toner over-application can flatten the shine of a keratin treatment.
Signs your treatment is fading early
- Frizz returning at week 4 or 5 (treatments should last 8 to 12)
- Roughness when you run your fingers through your ends
- Styling time creeping back up
- Color looking flat or matte where it was shiny
If you notice any of these before week 8, look at your shampoo first. Nine times out of ten it's a sulfate or sodium chloride issue.
When to book your next treatment
Brazilian Blowout: 10 to 12 weeks. Traditional keratin: 12 to 16 weeks. We recommend booking your next appointment before you leave the salon, so you don't end up in the awkward "I waited too long and now I have to start over" stretch.
For more on the treatment itself, see our Brazilian Blowout service page or our full keratin treatment guide for New Bedford.
Book your next smoothing treatment
Joseph's Hair Design, 54 Wood St, New Bedford. (508) 998-7147 or book online.