Where should a mouthpiece extend to?

• A. The last molar
• B. The front teeth
• C. The wisdom tooth
• D. The back of the tongue

Answer: (A)

Extending the mouthpiece to the last molar ensures full dental coverage and a stable bite during activity. Covering up to the last molar protects both the front and back teeth from impacts, helps distribute forces across the dentition, and keeps the guard securely in place when the jaw bites down or a blow occurs. If the guard stops at the front teeth only, the back teeth remain unprotected and the piece can ride up or dislodge, reducing safety. Extending to the wisdom tooth or stopping at the back of the tongue would not provide proper dental protection or fit, and could hinder breathing or comfort.