Any parent/coach/manager should insist mouthguards are worn, I would still have my two front teeth if I had one.
Concussions
https://www.sciencedaily.com/releases/2014/05/140501101133.htm
Teeth
https://www.colgate.com/en-us/oral-health/conditions/dental-emergencies-and-sports-safety/important-reasons-for-mouth-guards
Concussions
https://www.sciencedaily.com/releases/2014/05/140501101133.htm
Teeth
https://www.colgate.com/en-us/oral-health/conditions/dental-emergencies-and-sports-safety/important-reasons-for-mouth-guards