Don't trim if you don't have to...when you are natural (4a/4b), no matter how much you trim, if u just blow dry with a normal comb attachment and flat iron your ends will always look like that. You have to use a round or paddle brush with your blow dryer to straighten your ends out. When I first started straightening, I learned the hard way and kept trimming and trimming and wondered how come my ends kept looking like that. I finally invested in a hot air brush (just for my ends) which cut down on manipulation.