Many people donāt realize that the jaw is directly connected to the neck, the rib cage, and even the pelvis. When the jaw is tight, the neck becomes tight. When the neck becomes tight, the shoulders lift. When the shoulders lift, the ribs cannot expand well. When the ribs cannot expand, the breathing becomes shallow. When the breathing becomes shallow, the nervous system thinks there is stress. So a tight jaw can change: š Your posture š Your breathing š Your nervous system š Your pelvic floor tension š Your lower back ā¼ļø The jaw is not just for talking and eating. ā¼ļø The jaw is a posture and breathing muscle.