How to Repair a Ball Mark

How to Repair a Ball Mark Using the Birdicorn Golf Divot Tool

Fix that crater when you stick that flush iron shot.  You do this by pushing the grass around the mark toward the center. 
After you get it nice and even, press it down with the sole of your putter.

DO NOT lift or pull from the center as this will rip the roots and cause that part of the green to die.

Video Demonstration: