PDR is best for minor to moderate dents where the metal can be safely moved back into place

https://mill-wiki.win/index.php/Paintless_Dent_Repair_Explained:_How_PDR_Works_and_Why_It_Beats_Traditional_Body_Work

PDR is best for minor to moderate dents where the metal can be safely moved back into place, but it may not be suitable for deep damage with torn or broken paint.