The lower jaw, also known as the mandible, is the largest and strongest bone in the face. It holds the lower teeth and plays a crucial role in chewing and speaking. The mandible is connected to the skull at the temporomandibular joint (TMJ), allowing it to move up and down and side to side. The lower jaw consists of two main parts: the body and the ramus. The body is the horizontal portion that supports the teeth, while the ramus extends vertically to connect with the skull. Proper alignment and function of the mandible are essential for overall oral health and effective communication.