if you can get to the dent on the other side you can use this thing that they sell at most auto store and its like a mettle brick with diferent contours on it and you hold it up to the dent on the outside and use a dent hammer on the other side of the dent and flatten it out thats a really crappy explanation my bad just go to the auto parts store and go to the body section and look at all the tools and see what you need but becareful not to make it worse i did my first shot at body repair good luck