Good time to remind people, any helmet that has been in a crash, even ones that have just been banged around really hard, should not continue to be used.
Helmets have crush zones and structures that are designed to fail (inside and out) to protect you, but once they're used/deformed theyre done. Reusing a helmet beats nothing but you really should get a new one after each incident.
Idk, I had a few minor accidents with mine and it looks and sits ok. I think it's a rumor, spread by moto equipment corporations in order to prevent me from ending my own life in the next one