What is a common function of yawning related to the TMJ?

Yawning is associated with the wide opening of the jaw, making it beneficial for the temporomandibular joint (TMJ). During a yawn, the muscles that control the movement of the jaw are activated, allowing for a significant expansion of the mouth and providing a stretch to the jaw muscles. This action can help alleviate tension in these muscles, which may be particularly beneficial for individuals who experience TMJ disorders.

The other options do not specifically relate to the primary action of yawning concerning the TMJ. For instance, while yawning can contribute to relaxation, it does not primarily aim to increase muscle tension, nor does it significantly reduce airway resistance. Although yawning can offer some benefits related to airflow because of the wide opening, this is not its predominant function in terms of TMJ movement. Additionally, while maintaining oral hygiene is essential for overall health, yawning itself does not play a significant role in promoting oral hygiene directly. Therefore, the connection between yawning and the wide opening of the jaw highlights its relevance to TMJ function.