A mouthpiece should be placed on which jaw?

• A. Upper jaw
• B. Lower jaw
• C. Both jaws
• D. Not worn

Answer: (A)

The mouthpiece is placed on the upper jaw because it provides the most protection and stability during activity. Protecting the upper teeth is a priority since they are more exposed to impacts, and covering them with a guard over the maxillary arch creates a secure, retention-friendly fit that’s less likely to come out when you move, speak, or breathe. A guard on the lower jaw tends to be less stable, can interfere with speaking and breathing, and offers less protection to the upper teeth, which are the ones most at risk in many sports. That’s why placing the mouthpiece on the upper jaw is the standard, best practice.