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It's ok. I studied under the tutelage of the Great Navsso let me see if I can expound on the topic...
Um, generally speaking anything above 450 on a flat iron would cause damage (even with the heat protection). But the thing to keep in mind is that just b/c the iron is turned up to 420 degrees doesn't mean you can just run the flat iron through the hair all willy nilly. The heat doesn't immediately leave the hair once it's come in contact with the strand; the temp builds up. Like when you add cold veggies to a pot of boiling water...the water doesn't immediately go back to room temperature. It's still hot and actually not too far from the boiling point. So if you take 2 or more passes of an iron at 400 degrees that's double the heat setting...which means that heat damage is EASY to do. It's pretty safe to say that 350 degrees and lower is ok for the hair (provided you make 1-2 passes with the iron). If that doesn't work, review your prep for the hair prior to the flat iron (like how you dried the hair, what products you have on there, etc).
HTH