Shaneystar's advice is good. I have long, thick, wavy hair which is also chemically treated and I very rarely brush it, but wash it every 2 or 3 days and comb it through with a wide toothed comb (you can get them at Boots), working through the tangles with your fingers first if needs be. Most of the time I use a leave-in conditioner (look for one that's a creamy consistency rather than a water-like spray - Paul Mitchell The Conditioner is great although not cheap), followed by a serum and then Frizz-Ease Secret Agent cream where needed, but once a week I use an intensive conditioner (again, look for a thick consistency, not a thin drippy one) and leave it on for half an hour as Shaneystar describes. Netibiza is also right in that heat is bad for your hair, so allowing it to dry naturally when you can and going easy on heated appliances is a good idea. Another good tip is to sleep with your hair in a satin scarf or buy a satin pillowcase. May I add that Andy008 has obviously never tried his own tip, nor seen There's Something About Mary, or he would know better.