Great video.

They say pretty explicitely that it is only for large dents and will not work anywhere near a crease. Can cause paint damage, they say for smaller dents and door dings to use the same hair dryer and heat the area, then hold a small piece of dry ice in a pair of plyers and put it to the heated dent, it should pop right out. Caution: if the dent has any sort of scratch or gouge in the paint, when it pops, chances are, it will pop your paint off too....