I must have come off hundreds and hundreds of times off-road, with no helmet impacting the ground. Even 80mph flings when I lost it in sand.
I've come off hard maybe ten times on tarmac over 16/17 years, after one incident 9 years ago I didn't walk for a year. . .
Then, just under a year back, a KTM RFS spat me off (at 60mph)in the city. Apart from the skin loss and twisted knee I was okay - but my helmet took a hell of a beating.
That was good. I reckon it saved my jaw, teeth, forehead and nose from TOTAL re-construction.
Wear those helmets.