The case of your Kindle Paperwhite gets a lot of abuse from everyday life. Replace a cracked or a scratched case to restore that fresh out-of-the-box feeling.
Using a spudger or plastic opening tool, gently pry the bezel from the screen. It is easier to start in the corners and work your way around the bezel.
Do not insert the spudger too far under the bezel; it could easily damage the screen.