Don't fly with damaged props. If they're bent up or scratched or chipped, it's time to replace them. After all, these are what's keeping your drone in the sky.
Check your props before each flight, and if they're damaged, change them.
The Mini 3 Pro's props are held in place with screws. To prevent the props working loose, replace the screws with the screws that come with the new props. The replacement screws have a dab of thread locker on them to prevent vibrations working the screw loose.
Use a good screwdriver -- or the included screwdriver -- to remove the props. If you chew up that screw using bad tools, you're going to be hating life.
Don't take chances with your props.