The tongue strongly influences the jaw. Try opening your mouth fully with your tongue pulled back toward your throat. Then try opening your mouth with your tongue moving forward and downward like our tiger in the picture. You will find it a lot easier with the later method.
In North American culture your tongue should not be seen. It is associated with disrespect, laziness, and stupidity. When tense, we hold it back or press it to the roof of the mouth. All this has functional effects. Normally it should be resting close to the bed of the lower jaw.
1.Pull your tongue far back toward the throat. You might notice your jaw sliding back and your airways narrowing. You may feel your stomach contracting. Some people can feel a bit nauseous doing this (so don't do it too much!).
2. Press the tongue against the roof of your mouth. You may feel pressure in your sinuses or your nose. There will be an increase in tension in your facial muscles and your teeth might press together. Do you stop breathing when you do this?
Amazing! The tongue is a powerful muscle! Try this out to relieve jaw and tongue tension. If anything it will put a big smile on your face!