S-3.1, r. 11 - Regulation respecting combat sports

Full text
98. Where a contestant accidentally loses his mouthpiece, the referee shall stop the bout immediately after the exchange of blows taking place and shall send the other contestant to a neutral corner by pointing his finger.
One of the persons authorized to be present in the corner of the contestant who has lost his mouthpiece shall clean the mouthpiece and give it back to the contestant.
O.C. 662-95, s. 98.