R.I. Gen. Laws § 41-5.2-11: Uniform rules — Mouthpieces.

(a) All contestants are required to wear a mouthpiece during competition. The mouthpiece shall be subject to examination and approval by the attending physician.

(b) The round cannot begin without the mouthpiece in place.

(c) If the mouthpiece is involuntarily dislodged during competition, the referee shall call time, clean the mouthpiece, and reinsert the mouthpiece at the first opportune moment, without interfering with the immediate action.