You'll need to get at it from the inside and slowly tap it out while using a straight edge against the outside to make it flat again.
It's really hard getting dents out of corners. It'll b=never look perfect agin but you could probably make it look a lot better.
Dismantling the fridge doors might be trickier than it seems.
You could also consider buying a replacement door?
I just had a flashback to what happened to yours when I saw terlg's post.
@Oliver Schick started
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You'll need to get at it from the inside and slowly tap it out while using a straight edge against the outside to make it flat again.
It's really hard getting dents out of corners. It'll b=never look perfect agin but you could probably make it look a lot better.
Dismantling the fridge doors might be trickier than it seems.
You could also consider buying a replacement door?