My hair never reverted either...this was my horrible experience with BKT:
I got serious about my hair care regimen back in March 2009, where I did a big chop on my dread locks (intentional ones hehe). I decided I would grow my hair out naturally from the TWA and it grewly unbelievably well. I originally intended to relax the hair after I was satisfied with the growth, and I did in July of 2009, but instead of relaxing, I texlaxed with Phyto I (No-Lye). My hair came out beautifully, but I was gravitating more towards straight styles at the time and I didn't want to use heat all of the time. Hindsight is 20/20 because I should have just fully relaxed...
I started researching the BKT, thinking it would help me maintain straight styles. I found all of the information on it that I could and I did a home application, which isn't recommended, but I've been a DIYer for years and didn't regard that as being a huge issue. I did the treatment step by step, to the T. As I'm sure you know, the BKT requires you to use INTENSE heat with a flat iron on hair with ONLY the Keratin treatment on the hair, after blowdrying with a brush TWO TIMES. You're also supposed to have chemically treated hair. When I was looking into the BKT originally I was immediately scared about this tremendous amount of heat and manipulation, but after asking around and doing some more research, and seeing all of the beautiful and satisfied results, I figured that the BKT was supposed to act as a major heat protectant. So I went ahead and did the treatment and the results lasted for what seemed like only a few days, because very soon after that I noticed unusually large amounts of breakage and shedding. My hair was coming out in clumps! The hair was literally FRIED! You could basically see through one individual hair strand, it was transparent. The strands were starting to look more and more disgusting by the day. It hardly looked like hair. I panicked. I had literally ZERO shedding before the BKT, so it was devastating. The treatment is supposed to last up to about 4 months MAX, and then the hair should revert, but because of the immense heat damage that my hair has suffered, I have to gradually cut off the hair because it is so damaged that it WON'T revert. Before the BKT, my hair was on its way to APL, but because I've had to cut off hair, I will be lucky to make it to SL after my 6 month stretch is over in January. My ends still won't behave...I have extreme dryness (could also be attributed to the no-lye, which I've decided is not for me), products won't take easily, etc. PERMANENT DAMAGE that I have to CUT OFF! It's a H.A.M.
Here's
basically what happens when you do a BKT:
-Chemical service (not required but strongly recommend for optimal results)
-Clarify
-Blow dry with brush
-Apply Keratin treatment
-Blow dry again with brush
-Flat iron hair on at least 450 degrees! passing through each section at least 10 times!
-Leave the hair alone for 2-3 days
-First wash w/ shampoo sans sulfates
So on top of having a chemical in your hair, you're manipulating it with a brush and blowdryer, and then damaging it further with no heat protection with a flatiron set on 450 degrees, passing through the hair over and over until all of the "steam" from the formaldehyde has gone away! Even if I had put heat protectant in my hair, the treatment wouldn't have come out right because the treatment's effectiveness relies on the heat itself. I don't even know what possessed me to so much as think this was a good idea for my hair.
I took this from a website:
http://www.unsprung.net/BKT.html
Of all the current straightening procedures, the BKT is the simplest and safest for the hair. Unlike the TR solution, there is no way for the BKT solution to cause damage to the hair, as far as we can tell. No scalp bends, no overly broken down hair, no breakage. However, just like a TR, damage CAN be done during a BKT with the flatiron. During a BKT, it is recommended that the hair be flatironed at 450 degrees, which is simply too hot for some hair. Knowing when the 450 degree recommendation applies and when it doesn't, requires the skills of an experienced thermal straightening technician. If the hair can not take 450 degree heat, and is processed at a lower temperature, then the BKT might not last as long.
I didn't realize that the temperature could be lowered to spare the hair unnecessary heat if it couldn't take it because I was under the impression that it was 450 degrees or bust. Even then, if the temperature setting is lowered, the BKT can revert back much, much quicker and there goes hundreds of dollars out the window! (Having this done by a professional costs BIG $$!) And on top of that, the results that I have seen with the BKT can be achieved through other means, definitely.
Getting a BKT done properly is definitely possible, but is it worth the money, and potential long term damage? To me, no. I would highly recommend that you research the BKT fully if you are considering it and make a well-thought out final decision, because even after all of the research and preparation that I put into performing a home BKT, the outcome was horrific. This is just my own personal experience, and I still believe it can work for the right people under the right circumstances, but I strongly recommend exploring the alternatives.