It's pretty common to get dents in the corner of your bumper. The results are pretty good but depending how the dent has been in the bumper, results can vary.
You see, plastic has short term memory. That means the longer it stays in, the more challenging it becomes. Plastic will retain a shape after starting after 3 days. Even then you can be left with light waves or warping. However we are very good at what we do and we've been know to turn chicken poop into chicken soup!