After one time straightening my hair with a flat iron, it will not curl back, WHAT HAPPENED?

I recently moved to WA from IL and needed a trim on my very curly hair. I have straightened my hair before, I used to do it a lot, but have recently not been straightening my hair as much. It has been about 3 or so months since the last time I straightened it.SO! I went to get my hair trimmed and they did the basic blow dry and flat iron and after 3+ washes the hair around my face is practically straight with no curl!! I have no idea what to do, I am going to go to the salon tomorrow and try to figure this out. The woman doing my hair said that she used a protecting spray and she used a low heat on the iron and it doesn't look unhealthy. It's strong, thick and shiny, even the straight parts so I don't think it is damaged...Please help me!! :(

7 Answers

Are you living in a very dry area of Washington? Some place with very low humidity? This can affect your curl pattern quite a bit. My hair is much straighter when I visit Denver, for example. Really weird! :)
In the curly girl handbook, Lorraine Massey states that even one "harmless" blow dry or flat iron can actually set someone and their curls back quite a bit. But I think there's more to this than meets the eye. One flat iron won't destroy your curl pattern past the point of no return. That takes months of continuous unprotected flat ironing. You need to find out exactly what products she used on your hair, especially that protecting spray. A lot of flat iron sprays have silicones to protect the hair shaft, but also tons of chemicals that are meant to give you "keratin treatment results" but last a shorter amount of time. I've seen these products in stores as well as many salons my family and I have been to. I have a feeling that she used a product that temporarily straightens hair. It's the only thing that would really explain this. Definitely pay them a visit.
Mine does that, go a few weeks without using heat and they should go back to normal!
I've been 2 months without flat ironing and the holidays are coming up. I'm so terrified to straighten my hair, but I always do this time of year. I've decided to leave it curly and I'm so nervous about it. I don't feel it has rehabilitated enough to show off for birthdays/holidays and seeing family you haven't seen in a long while. Hope it all works out for you!
I suggest you use a protein treat like Aphogee 2 minute reconstructor. It's a light protein treatment that repairs hair that suffers from heat damage and other problems. You should use it every few week untill your hair is healthy again. 
Hey! I wanted to ask you if your hair got back to normal. The same thing just happened to me and i dont know what to do. I already washed it a couple of times but its not getting as curly as it usually is. Please help!
I just straightened my hair with a flat iron and now my curls won't return. I've never had this problem before. I rarely straighten my hair by when I do it usually starts curling from humidity alone. I used a keratin leave-in conditioner that is supposed to protect hair from heat damage. Is this what caused me to lose my curls? Has anyone found a way to undo this? Any suggestions would be greatly appreciated! I've washed it three times and it still won't curl