Pawnbroking, by definition, involves used stuff, which means dealing with wear and tear and dirt. We clean jewelry and steam diamonds, for example.
Here’s a simple way to deal with dents in your sterling silver hollowware (or gold hollowware, in the rare event you have any of that):
Recently we bought a Tiffany sterling water pitcher with a thumb-size dent in the body, probably from dropping on the floor. Pushing the dent out was easy — just roll a hard sphere back and forth from the inside.
We used a billiard ball.