Is it dangerous to get keratin over bleached hair?

Not only that, I've had friends who have been told by their hairdresser that their hair is "in good condition considering", yet their hair is breaking off a week later.

Not only that, I've had friends who have been told by their hairdresser that their hair is "in good condition considering", yet their hair is breaking off a week later.

Yep, hairdressers are people just like everyone else, and it's actually quite scary how many of them don't realise that hair condition can be easily faked/masked.

I still say go with Joico.  I know your hairdresser said you'd be ok with occasional flat irons, but I personally wouldn't risk any sort of heat-activated keratin treatment.  Just go for one that doesn't use heat.  There's several options available.

Joico is amazing! I accidentally fried my hair (before I found this site and didn't know what I was doing) and because of regular Joico treatments I ended up only having to cut my hair to shoukder length to get rid of the damage - for a while there I honestly thought I was going to have to have a pixie crop!

Personally I wouldn't have a keratin treatment done on my hair (even though it's fine and I've heard Keratin can make it look thicker) because of all the horror stories I've heard.

I love the Joico reconstructor but I absolutely adore the Cocochoco Brazilian Keratin Treatment, the one Alexia did a review on here:
http://www.hairdyeforum.com/index.php?topic=12334.0

The instructions say to blow dry it then to go over the section something like 5 times with the highest heat though, which I didn't do but I still got very good results from it on my bleached hair. I did use a higher heat setting but I went over it once or twice in my more wavy areas, just to get them straight. I really like this particular one as it's silicone free. In all my local shops I haven't found a single blowdry/flat iron keratin treatment that is silicone free. Anyway though, if you're afraid of the flat ironing part damaging your hair, you could always just blow dry it and skip the flat ironing. You may not get as long lasting of an effect but if your hair can't handle the flat ironing I think it would be a good compromise. Or you could try flat ironing a small section and see how it holds up, like a test strand. I didn't even use a brush when I was blowdryig mine and it already was SO much straighter, especially my naturally tight S wave parts at the back of my head.

I think the ingredients in the product are very important, especially on bleached hair, just as important as determining what process would be best for you (just blowdrying, a leave in, bd + flat ironing, etc). IMO having silicones in a treatment like that is like the company cheating you - of course the majority of peoples hair is going to look shinier and feel nicer with some silicones baked into it, but the whole purpose of the treatment is for the keratin and strength, not silicones.