In a quadcopter crash, your propellers could be bent. As a result there might appear white crease lines around the prop hub. It might look like you can just bend it back because it wasn’t totally snapped. My advice is, Replace that propeller !
Props with the white line can potentially break apart at any time in the air. Especially so when you are flying at high throttle, which puts tremendous amount of pressure on the damaged prop, they could just snap mid air when your quadcopter is travelling at high speed.
This has happened to me twice now, the first time I broken an arm on my plastic FPV250, as it just flipped over and I lost control. The second time I managed to still control it and land it, while it’s rotating around yaw axis involuntarily like a helicopter lost its tail rotor. I was pretty impressed by myself as I was able to fly a quad with 3 and a half props :D but it could have been much worse since I doing punch out.
Here is an example, you could already hear the rattling sound from the bent prop.
Another note on similar issue, avoid props in white colour. It’s extremely difficult to see the white crease lines, which is also potential risk.