According to World Rugby, scrum caps and head guards that comply with world rugby standards can prevent soft tissue injuries to the head and ears.
There is no proof however, that they protect against concussion.
For a child playing contact sport, isn't any level of protection worth having? And shouldn't it be something we make compulsory for junior rugby, at the very least?
As a mother of a rugby-mad son, any level of protection is enough of a reason for him to wear headgear. But unfortunately there seems to be a stigma around wearing headgear when you're nine.