You've had your car only six months. Then one day you spot it from a hundred yards away--your first dent. After careful inspection, you notice the paint hasn't been scratched. The dent itself is fairly regular, without deep crevices or crumpled areas, so you decide to have a go at fixing it yourself.
Heat the dent and the area around it with a hair dryer for a minute. Then immediately soak the dent completely with the liquid from a can of compressed air. Hold the can upside down and pull the trigger. The liquid will freeze on contact with the car's heated body, and the resulting temperature change should restore the original shape of the metal.
Don heavy duty gloves and press a block of dry ice against the dented area until it sticks. The bond will be strong enough that you can grip the ice with your gloved hands and pull the dent out. To release the ice, hose it down with water.
Wet the area with a little water, then press a 6-inch dent-pulling suction cup or plunger against the metal. Try to surround the dent and make sure there is a good seal. Pull on the suction cup handle or your plunger handle to pop the dent out. To check your progress occasionally or to reposition your suction cup, release it with the pull tab at the edge.
