A round shall not begin until the participant's protective mouthpiece is in place. If, during a round, the mouthpiece falls out of the participant's mouth, the referee shall, at the next lull, stop the bout and escort the participant to the corner. The mouthpiece shall be rinsed out and replaced in the participant's mouth by a second in that participant's corner and the contest shall continue. If the referee determines that the mouthpiece was intentionally ejected by the participant, the referee may direct the judges to deduct points from that participant's score for the round.
Okla. Admin. Code § 92:10-5-6