okay okay its the straightener, and not only is it just the straightener, its the specific brand of straightener and as a matter of fact that particular unit, get a diff one and all will be hunky dory.
to be extra sure, I will write you ataveez for $14.95 plus shipping and handling to reverse the effect of that specific brand hair straightener.
PCG, I started to go gray in my teens, long before I started colouring my hair. At the moment, I have loads of gray and it's a combination of genetics and colouring my hair a new shade every few months.
Like others have said, the straightener has nothing to do with it. It could even be stress related.
Ive cousins who've never done a single thing to thier hair, like color or blow dry even, besides brush it , n they have lots of grey hairs.. I dunno why teh wrry, just color it i guess? My dad is like 60 now, n he has grey hair at the temples thats it.. the rest of it is black, ppl think he colors it but he doesnt..