So my girlfriend's asking about whether or not it's mandatory to wear mouth guards in the NHL for a project she's doing in her PR program. She's showing interest in hockey (even if it is just equipment) so I clearly need to jump all over this.

Only problem is I can't find anything saying whether or not it is currently mandatory to wear one. I found something saying it wasn't in 2009. Anyone able to help with this or know where I should look?

Thanks in advance!

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