The reminder is coming from Jim O'Shea, who's the Referees Administrator for the Premier County.
Gum shields have been mandatory for players at all age grades since the start of 2014.
Jim says everybody has to abide by this rule.
In GAA action, The Clare minors host Kerry this evening in their Electric Ireland Munster Football Championship semi-final.
Throw-in at Miltown Malbay is at 7pm.
