What muscle is used for snapping shut his jaw?

The primary muscle used for snapping the jaw shut is the masseter muscle. This thick, rectangular muscle is located at the back of the jaw and plays a crucial role in chewing. When contracted, it elevates the mandible (lower jaw) to close the mouth forcefully. Other muscles, such as the temporalis and pterygoid muscles, also assist in jaw movement but the masseter is the main muscle responsible for the forceful closure.