What color can the mouth protector not be?

The correct response is that a mouth protector cannot be completely white because it is a specific rule outlined in the NFHS Football Rules, which states that mouth protectors must be of a color that is easily identifiable. A completely white mouth protector fails to meet this standard, as it may blend in with the players' teeth or other equipment, making it difficult for referees, coaches, and players to see.

In contrast, colors like red, blue, and yellow are clearly identifiable and do not pose the same visibility issues, allowing for better recognition during play. Thus, the emphasis on color in the regulations is aimed at ensuring safety and effective communication on the field, making compliance with this detail essential for all players.