They prevent major damage to the teeth, gums and mouth if a player is hit in the jaw (the guard cushions the teeth together and stops the tongue from being bitten). THey can also help lessen the impact and slightly reduce the risk of concussion.
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because your mom needed teeth protection in her game of tag team that is why it was invented.
Because, if you get hit in the head the shock can cause you to bite down, which would result in smashed teeth. So the mouth guard protects you from biting down.