I straighten my hair almost every day as well and have a few splits too. I find that using silicone-based products has helped make my hair appear less damaged, even though silicones in the long run aren't so great for your hair. So far my hair responds well to them so I'm not going to stop!! Oh and the advice above is a good one, it's called "dusting" - get a tiny, very sharp pair of scissors and look at every single individual strand of hair and "dust" the ones with splits - just cut off the split and nothing else. Keeps your hair healthier without having to lose a lot of length going for a full trim!