Paintless Dent Repair (PDR) removes dents by gently reshaping metal from behind the panel

https://martinhwtj700.ironwoodscope.com/posts/auto-body-dent-repair-vs-paintless-dent-removal-what-s-the-difference-2

Paintless Dent Repair (PDR) removes dents by gently reshaping metal from behind the panel, keeping the factory paint intact and avoiding fillers, sanding, and repainting.