Section 2: Equipment

Rule 1-3-1(d) addresses intra-oral mouthpieces — if worn, they must be a visible non-white color — and states that "the use of a mouthpiece is strongly recommended," stopping short of making it mandatory equipment. Rule 1-3-3 (Illegal Equipment) p...

Source: Rule 1, Article 1, Section 2

Send this to your friend — argument over.