Door dents are tricky. There's usually a bar that goes across the inside of the door. If that's bent your door is considered bad and needs to be replaced. If you wanna do it right you have to disassemble the door and take some body hammers to the inside. Or you can use a slide hammer but you'd have to weld the hole it makes. Or you can grind down the paint, use a pin welder and weld pins to it and get a pin slide and pull the dent.... once you fix the dent it may still pop in and out bc the metal has been changed. You need a shrinking hammer and a dolly and hit around the outside of the dent for it to stop going in and out.... or if you don't wanna do all that work go down to the auto parts store and get one of those dent kits that "fixes anything". I've never used it so I don't know if it'll work and I think it glues to your car so you'd have to remove the glue after.
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