I think broken hairs can be white on the tip. I remember when I used to flat iron every day there would often be a broken area in the hair shaft, which I could just snap by pulling lightly.
It can be hard to tell if your hair is breaking off with it curly... when it is straightened you might have a lot of flyaways that are shorter than the rest of your hair.
It looks like you're new here. If you want to get involved, click one of these buttons!