The dent goes away either way. The question is what's left behind.
Any competent shop can make a door ding disappear. The difference between paintless dent repair
and a conventional repair isn't really the dent — it's whether your car still wears the paint it
left the factory with afterwards, and whether anyone can tell.
Factory paint can't be reproduced later
Your car's finish was applied to a bare shell before it had glass, trim, wiring or an
interior, and cured at temperatures nothing fitted to a finished car could survive. That's not
a criticism of refinishing — it's simply a set of conditions that no longer exist once a car
is built. A refinish can be excellent. It can't be that.
Refinished panels are findable
A paint depth gauge costs very little and reads in seconds. Dealers taking trade-ins use them.
Lease inspectors use them. Careful private buyers use them. A refinished panel reads
differently from an original one, and no amount of quality in the work changes that — a
beautiful repair is still detectable as a repair.
It's a permanent change
You can repair a dent twice. You can't un-refinish a panel. Once the original coating is
sanded off it's gone for the life of the car, which is why it's worth asking whether the dent
can be removed without touching it — before, rather than after.
Ask one question before you agree to any dent repair: "can this be done without
painting it?" Sometimes the answer is no, and we'll tell you so plainly. But it should
always be the first question, because it's the only decision in the whole job that can't be
reversed.
To be clear about the other side of this: a properly refinished panel is not a
defect. Millions of well-repaired cars carry them, they look right, they last, and when a dent
has sharp edges, torn metal, broken paint or sits at the edge of a panel, refinishing is the
correct answer rather than a compromise. We do that work too, and we do it properly.
The point isn't that paint is bad. It's that keeping the original is a one-time opportunity, and
it's worth thirty seconds of conversation before it's gone.