They are not an essential item but are advisable. When tackled or tackling there is a strong possibility of the mouth coming in to contact with the ground or other players. The shields do prevent many teeth being knocked out.
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Absolutely essential unless you want your teeth knocked out. Or a really nasty concussion (yeah, somehow they supposedly protect against concussions). Although you might get one anyway.
hi, you do not have to wear a gum shield but is best to do so otherwise you may bite of your tongue
There are no regulations in either codes that require a player has to wear a mouth guard. It does state in both code the approved guards that any player can wear.