I tried this method and work very good on my old dodge.
the video remove car dent witha hair dryer and air duster
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Step 1: Heat the Dent
take a aluminium foil to protect your paint.and warm up with a lighter about 30 to 60 seconds.
Step 2: Metal Contraction
fast apply a throw of liquid air.Hot and cold contracted the metal.
Take your Air duster for computer, and turn it upside down. This way you make liquid air available.
Apply about 5 seconds
Step 3: Now the Dent Is Gone
just clean and its done .This method work good on medium dent.DonT work on polymer car. sorry :)