Is a mouthpiece required in football?

A mouthpiece is considered mandatory equipment and must be worn in NCAA football.

The rule is 1-4d and it states:

"ARTICLE 4. All players shall wear the following mandatory equipment,

which shall be professionally manufactured and not altered to decrease

protection....

d. Mouthpiece. An intra-oral mouthpiece of any readily visible color

(not white or transparent) with FDA-approved base materials (FDCS)

that covers all upper teeth..."