Coat your hair with a protective conditioner or specially-made hair wax before using heat-styling implements. Heat can dry out your hair over time, causing breakage and split ends. Some hair product manufacturers make special formulations, created for heat styling use. Typically, you just rub or spray a small amount through your hair, right before styling.
Many people believe that trimming your hair on a regular basis will cause the hair to grow faster, but that is not necessarily true. The main reason that you should keep your hair trimmed is to prevent yourself from developing split ends, which look very unsightly and can cause further hair damage.