it is believed that when you place your tongue against the roof of your mouth, it activates a subtle energy system within your body. This system includes energy channels called nadis and energy centers known as chakras. By creating this connection, called Jivha Mudra or tongue posture, it is thought that the flow of life force energy, or prana, is directed and channeled more effectively throughout the body. This practice can therefore help bring balance and harmony to the entire energy system.